Fleetguard · HF Hydraulic · return line

HF6551 filter element: specifications & equivalents

Q: What are the dimensions of the HF6551 filter element?

The published envelope is 97.94 mm OD × 240.03 mm length (3.856 × 9.450 in). Confirm against the housing drawing before ordering.

Q: What micron rating does HF6551 use?

This element is rated 1 µm (nominal class) — TWA 1 µm at β=2; 7.9 µm at β200(c) per ISO 16889. Always compare Beta ratings at the same test point: two brands may print different micron numbers for the same physical grade.

The HF6551 is a Fleetguard return-line hydraulic filter element, sized 97.94 × 240.03 mm OD × length, rated at 1 µm class (TWA 1 µm at β=2; 7.9 µm at β200(c) per ISO 16889). Verify against the current manufacturer data sheet before ordering.

Envelope OD × L 97.94 × 240.03 mm

Filtration rating 1 µm nom.

Beta rating TWA 1 µm at β=2; 7.9 µm at β200(c) per ISO 16889

Thread 1.00 3/8-12 UNF-2B

Line type return

Catalog verified. Parameters extracted from the manufacturer’s electronic catalog / official interchange document and checked 2026-09-28. Confidence score 0.90.

Specifications and cross-references are taken from the Fleetguard online catalog API. Where both TWA and Beta ratings are published the conventions differ — verify cleanliness targets, collapse rating and seal configuration against the current Fleetguard data sheet before ordering.

Specification table

Parameter	Value
Filter type	return line
Filtration rating	1 µm
Rating basis	nominal
Beta ratio	TWA 1 µm at β=2; 7.9 µm at β200(c) per ISO 16889
Outside diameter OD	97.94 mm
Length	240.03 mm
Thread / connection	1.00 3/8-12 UNF-2B
End caps	spin-on baseplate with attached gasket
Flow direction	outside-in
Integral bypass valve	none (housing/valve-dependent)
Manufacturer part no.	HF6551
Source catalog	Cummins Filtration / Fleetguard: Fleetguard online product catalog (fleetguard.com)
Last verified	2026-09-28

Sources: Cummins Filtration / Fleetguard — Fleetguard online product catalog (fleetguard.com) — accessed 2026-09-28.

Fleetguard® and all model designations are trademarks of their respective owners, used here for identification only — ElementRef is an independent reference site, not an authorized Fleetguard distributor.

Dimensions & series range

Outside diameter	97.94 mm (3.856 in)
Overall length	240.03 mm (9.450 in)

All 98×240 mm interchange elements →

Cross references & equivalents

Equivalent model	Brand	Match level	Note
↔ 1001081316 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 1001081316 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1022822 page in verification queue	UFI	partial	Fleetguard's online catalog lists 1022822 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1022828 page in verification queue	UFI	partial	Fleetguard's online catalog lists 1022828 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 104508005 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 104508005 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 10462554 page in verification queue	UFI	partial	Fleetguard's online catalog lists 10462554 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1081093 page in verification queue	UFI	partial	Fleetguard's online catalog lists 1081093 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 11036607 page in verification queue	UFI	partial	Fleetguard's online catalog lists 11036607 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 110366077 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 110366077 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1103765006 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 1103765006 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 110376506 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 110376506 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1105165 page in verification queue	UFI	partial	Fleetguard's online catalog lists 1105165 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 11419264 page in verification queue	UFI	partial	Fleetguard's online catalog lists 11419264 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 11448509 page in verification queue	UFI	partial	Fleetguard's online catalog lists 11448509 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1186656 page in verification queue	UFI	partial	Fleetguard's online catalog lists 1186656 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 131838 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 131838 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 132575302 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 132575302 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1377747 page in verification queue	UFI	partial	Fleetguard's online catalog lists 1377747 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1451200 page in verification queue	UFI	partial	Fleetguard's online catalog lists 1451200 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1494 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 1494 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1496 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 1496 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1507587 page in verification queue	UFI	partial	Fleetguard's online catalog lists 1507587 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1623109 page in verification queue	UFI	partial	Fleetguard's online catalog lists 1623109 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 16563975 page in verification queue	UFI	partial	Fleetguard's online catalog lists 16563975 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1664647 page in verification queue	UFI	partial	Fleetguard's online catalog lists 1664647 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1803813 page in verification queue	UFI	partial	Fleetguard's online catalog lists 1803813 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1863799 page in verification queue	UFI	partial	Fleetguard's online catalog lists 1863799 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 18637992 page in verification queue	UFI	partial	Fleetguard's online catalog lists 18637992 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1919784 page in verification queue	UFI	partial	Fleetguard's online catalog lists 1919784 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1920717 page in verification queue	UFI	partial	Fleetguard's online catalog lists 1920717 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1931182 page in verification queue	UFI	partial	Fleetguard's online catalog lists 1931182 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1967614 page in verification queue	UFI	partial	Fleetguard's online catalog lists 1967614 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1G8878 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 1G8878 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 2226568 page in verification queue	UFI	partial	Fleetguard's online catalog lists 2226568 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 3027298 page in verification queue	UFI	partial	Fleetguard's online catalog lists 3027298 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 303506819 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 303506819 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 317885 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 317885 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 3321871 page in verification queue	UFI	partial	Fleetguard's online catalog lists 3321871 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 3416643 page in verification queue	UFI	partial	Fleetguard's online catalog lists 3416643 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 35243 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 35243 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 3602630 page in verification queue	UFI	partial	Fleetguard's online catalog lists 3602630 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 371975 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 371975 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 372246A1 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 372246A1 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 3726771M1 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 3726771M1 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 391433 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 391433 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 3I0610 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 3I0610 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 3J02808960 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 3J02808960 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 402652A1 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 402652A1 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 41444 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 41444 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 427283 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 427283 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 4272830 page in verification queue	UFI	partial	Fleetguard's online catalog lists 4272830 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 4427013 page in verification queue	UFI	partial	Fleetguard's online catalog lists 4427013 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 451750014101 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 451750014101 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 46209 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 46209 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 4656502 page in verification queue	UFI	partial	Fleetguard's online catalog lists 4656502 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 4656504 page in verification queue	UFI	partial	Fleetguard's online catalog lists 4656504 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 4700391433 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 4700391433 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 47131179 page in verification queue	UFI	partial	Fleetguard's online catalog lists 47131179 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 47131180 page in verification queue	UFI	partial	Fleetguard's online catalog lists 47131180 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 48142231 page in verification queue	UFI	partial	Fleetguard's online catalog lists 48142231 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 496209 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 496209 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 4C9479 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 4C9479 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 501209880 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 501209880 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 50SL80DH20SLS000P page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 50SL80DH20SLS000P as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 50SL80DK25 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 50SL80DK25 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 512558D1 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 512558D1 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 5127430 page in verification queue	UFI	partial	Fleetguard's online catalog lists 5127430 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 5127431 page in verification queue	UFI	partial	Fleetguard's online catalog lists 5127431 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 51494	WIX Filters	partial	Fleetguard's online catalog lists 51494 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 51496	WIX Filters	partial	Fleetguard's online catalog lists 51496 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 57247	WIX Filters	partial	Fleetguard's online catalog lists 57247 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 58118020 page in verification queue	UFI	partial	Fleetguard's online catalog lists 58118020 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 58118020X page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 58118020X as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 5839HF6553 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 5839HF6553 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 59075440 page in verification queue	UFI	partial	Fleetguard's online catalog lists 59075440 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 609934 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 609934 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 6194045M91 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 6194045M91 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 6512455M2 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 6512455M2 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 6631705 page in verification queue	UFI	partial	Fleetguard's online catalog lists 6631705 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 6668819 page in verification queue	UFI	partial	Fleetguard's online catalog lists 6668819 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 71372341 page in verification queue	UFI	partial	Fleetguard's online catalog lists 71372341 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 7247 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 7247 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 73113001 page in verification queue	UFI	partial	Fleetguard's online catalog lists 73113001 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 74830 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 74830 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 76025691 page in verification queue	UFI	partial	Fleetguard's online catalog lists 76025691 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 76698 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 76698 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 78430 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 78430 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 81863799 page in verification queue	UFI	partial	Fleetguard's online catalog lists 81863799 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 818663799 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 818663799 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 8320047 page in verification queue	UFI	partial	Fleetguard's online catalog lists 8320047 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 84230 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 84230 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 84237579 page in verification queue	UFI	partial	Fleetguard's online catalog lists 84237579 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 84247 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 84247 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 84469093 page in verification queue	UFI	partial	Fleetguard's online catalog lists 84469093 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 84475949 page in verification queue	UFI	partial	Fleetguard's online catalog lists 84475949 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 84516422 page in verification queue	UFI	partial	Fleetguard's online catalog lists 84516422 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 84814635 page in verification queue	UFI	partial	Fleetguard's online catalog lists 84814635 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 853531244 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 853531244 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 85494 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 85494 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 85496 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 85496 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 85817 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 85817 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 86029163 page in verification queue	UFI	partial	Fleetguard's online catalog lists 86029163 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 86583919 page in verification queue	UFI	partial	Fleetguard's online catalog lists 86583919 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 86597475 page in verification queue	UFI	partial	Fleetguard's online catalog lists 86597475 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 8700068 page in verification queue	UFI	partial	Fleetguard's online catalog lists 8700068 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 87010592 page in verification queue	UFI	partial	Fleetguard's online catalog lists 87010592 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 87010593 page in verification queue	UFI	partial	Fleetguard's online catalog lists 87010593 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 87106336 page in verification queue	UFI	partial	Fleetguard's online catalog lists 87106336 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 87308945 page in verification queue	UFI	partial	Fleetguard's online catalog lists 87308945 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 87413810 page in verification queue	UFI	partial	Fleetguard's online catalog lists 87413810 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 88292046684 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 88292046684 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 89821387 page in verification queue	UFI	partial	Fleetguard's online catalog lists 89821387 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 8E9623 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 8E9623 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 92492 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 92492 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 92494 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 92494 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 92496 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 92496 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 933430 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 933430 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 942621 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 942621 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 944014Q	Parker	partial	Fleetguard's online catalog lists 944014Q as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 944023Q	Parker	partial	Fleetguard's online catalog lists 944023Q as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 944027Q	Parker	partial	Fleetguard's online catalog lists 944027Q as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 96466 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 96466 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 97710 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 97710 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ A413G15 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists A413G15 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ AF609934 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists AF609934 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ AG133231 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists AG133231 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ AG609934 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists AG609934 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ AKK23814 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists AKK23814 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ AL118036 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists AL118036 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ AL233526 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists AL233526 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ AY093 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists AY093 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ BFLBE page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists BFLBE as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ BT734 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists BT734 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ BT8377MPG page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists BT8377MPG as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ BT8851-MPG	Baldwin Filters	partial	Fleetguard's online catalog lists BT8851MPG as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ BT8853-MPG	Baldwin Filters	partial	Fleetguard's online catalog lists BT8853MPG as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ BT9466MPG page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists BT9466MPG as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ CG49CC16 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists CG49CC16 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ CG49CC5 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists CG49CC5 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ CPK1530 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists CPK1530 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ D516823 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists D516823 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ E5177 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists E5177 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ F026404005 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists F026404005 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ F0NN6714CA page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists F0NN6714CA as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ F0NN6714CA12H page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists F0NN6714CA12H as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ FONN6714CA12H page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists FONN6714CA12H as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ GEO496 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists GEO496 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ H18W11 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists H18W11 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ H55221 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists H55221 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ HC112 page in verification queue	Pall	partial	Fleetguard's online catalog lists HC112 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ HC55090 page in verification queue	Pall	partial	Fleetguard's online catalog lists HC55090 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ HF0655100 page in verification queue	Fleetguard	partial	Fleetguard's online catalog lists HF0655100 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ HF3090 page in verification queue	Fleetguard	partial	Fleetguard's online catalog lists HF3090 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ HF3110 page in verification queue	Fleetguard	partial	Fleetguard's online catalog lists HF3110 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ HF860 page in verification queue	Fleetguard	partial	Fleetguard's online catalog lists HF860 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ HF861 page in verification queue	Fleetguard	partial	Fleetguard's online catalog lists HF861 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ L1817 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists L1817 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ L496 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists L496 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ LA323543250 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists LA323543250 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ LFH4473 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists LFH4473 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ LFH4990 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists LFH4990 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ N14232 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists N14232 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P164378	Donaldson	partial	Fleetguard's online catalog lists P164378 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P165332	Donaldson	partial	Fleetguard's online catalog lists P165332 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P169958 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P169958 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P173205 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P173205 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P173737 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P173737 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P174650 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P174650 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P177047	Donaldson	partial	Fleetguard's online catalog lists P177047 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P560592 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P560592 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P573360 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P573360 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P573994 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P573994 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P6892 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P6892 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P6893 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P6893 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P7539 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P7539 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P763535 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P763535 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PERI378 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists PERI378 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PF2202 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists PF2202 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PFL6639 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists PFL6639 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PM11652 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists PM11652 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PSH422 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists PSH422 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PSH607 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists PSH607 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PT8377MPG page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists PT8377MPG as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ RE39390 page in verification queue	STAUFF	partial	Fleetguard's online catalog lists RE39390 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ RE39527 page in verification queue	STAUFF	partial	Fleetguard's online catalog lists RE39527 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ RE47313 page in verification queue	STAUFF	partial	Fleetguard's online catalog lists RE47313 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ S76538 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists S76538 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ SH66332 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists SH66332 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ SH66378 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists SH66378 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ SPH12512 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists SPH12512 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ SPH9553 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists SPH9553 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ SPH9648 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists SPH9648 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ T175002 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists T175002 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ VOE11036607 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists VOE11036607 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ VOE110366077 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists VOE110366077 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ VOE110376506 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists VOE110376506 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ VOE11419264 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists VOE11419264 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ VOE16563975 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists VOE16563975 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ VOE97710 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists VOE97710 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ WH9801 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists WH9801 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ WH9802 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists WH9802 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ WH9803 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists WH9803 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ WOH706 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists WOH706 as an interchange for HF6551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.

Interchange levels: full catalog-confirmed drop-in · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.

How the HF6551 model number is decoded

HF6551Fleetguard HF-series hydraulic spin-on filter part number.
240.03 mmOverall height.
97.94 mmLargest outside diameter.
1.00 3/8-12 UNF-2BSpin-on mounting thread.
TWA 1 µm at β=2; 7.9 µm at β200(c) per ISO 16889Published efficiency ratings.

Typical equipment & applications

Construction, agricultural and industrial hydraulic circuits
Mobile-equipment hydraulic return and pressure lines

Selection pitfalls — read before you substitute

A return-line element is not a pressure-line element: return cartridges (BN4HC low-collapse) tolerate roughly 20 bar differential, while BH4HC pressure executions are rated to 210 bar. Installing a low-collapse element in a pressure housing can rupture the media on cold-start spikes.
This element has no integral bypass — opening pressure is set by the housing’s reusable bypass valve. Confirm the valve setting (commonly 3.4 bar) is present before fitting.
“10 µm nominal” and “12 µm at β1000” can describe the very same media — one is reported at β≥200, the other at β≥1000 per ISO 16889. Compare ratings at the same Beta test point, not just the printed micron number.
Nitrile (NBR) seals are standard for mineral hydraulic oil but fail early in some phosphate-ester fluids and at sustained high temperature; verify seal compound against the fluid data sheet (fluorocarbon/Viton executions may be required).
Fine 1 µm media loads faster and runs at a higher cold Δp than coarser grades — only downgrade cleanliness targets if the system ISO 4406 code allows it.
End-cap geometry and the number/position of O-rings block interchange even when OD and length match — visually compare end caps before fitting, especially with aftermarket cartridges.

Frequently asked questions

What are the dimensions of the HF6551 filter element?

The published envelope is 97.94 mm OD × 240.03 mm length (3.856 × 9.450 in). Confirm against the housing drawing before ordering.

What micron rating does HF6551 use?

This element is rated 1 µm (nominal class) — TWA 1 µm at β=2; 7.9 µm at β200(c) per ISO 16889. Always compare Beta ratings at the same test point: two brands may print different micron numbers for the same physical grade.

What replaces the HF6551 filter element?

202 partial match(es) requiring parameter review

How do I read the HF6551 part number?

See the designation decoder above: each segment of HF6551 encodes size, line type, filtration grade and media/collapse execution.

Is a same-envelope aftermarket element always a drop-in replacement?

No. Matching OD and length only proves the cartridge fits the bowl. End-cap style, seal compound, micron/Beta rating, collapse pressure and bypass configuration must also match; the table above tags every equivalent as full, partial or verify for exactly this reason.

How often should a hydraulic return-line element be replaced?

Replace at the housing manufacturer’s recommended differential-pressure setting (commonly signalled by a clogging indicator), or on a time-based service interval when no indicator is fitted — never wait for bypass to open continuously, because unfiltered oil then reaches the valves.

Same-envelope elements from other brands

View full interchange →

These 10 catalog element(s) share the 98×240 mm envelope. Envelope match alone does not guarantee interchangeability — compare micron/Beta, seals and collapse rating.

HF6518 Fleetguard · 3 µm HF6555 Fleetguard · 7 µm HF6557 Fleetguard · 9 µm HF6561 Fleetguard · 3 µm HF6565 Fleetguard · 9 µm HF6569 Fleetguard · 25 µm HF6573 Fleetguard · 6 µm HF6575 Fleetguard · 9 µm HF6577 Fleetguard · 25 µm HF6578 Fleetguard · 8 µm

Other models in the HF Hydraulic series

All 2621 →

HF28084 HF28086 HF28088 HF28201 HF28202 97×247 mm HF28652 HF28658 95×193 mm HF28660 HF28662 HF28667

Reviewed & verified by the ElementRef engineering desk against Cummins Filtration / Fleetguard on 2026-09-28. Read our editorial & correction policy.