Fleetguard · HF Hydraulic · return line

HF6550 filter element: specifications & equivalents

Q: What are the dimensions of the HF6550 filter element?

The published envelope is 97.89 mm OD × 153.67 mm length (3.854 × 6.050 in). Confirm against the housing drawing before ordering.

Q: What micron rating does HF6550 use?

This element is rated 1 µm (nominal class) — TWA 1 µm at β=2 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 HF6550 is a Fleetguard return-line hydraulic filter element, sized 97.89 × 153.67 mm OD × length, rated at 1 µm class (TWA 1 µm at β=2 per ISO 16889). Verify against the current manufacturer data sheet before ordering.

Envelope OD × L 97.89 × 153.67 mm

Filtration rating 1 µm nom.

Beta rating TWA 1 µm at β=2 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 per ISO 16889
Outside diameter OD	97.89 mm
Length	153.67 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.	HF6550
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	97.89 mm (3.854 in)
Overall length	153.67 mm (6.050 in)

All 98×154 mm interchange elements →

Cross references & equivalents

Equivalent model	Brand	Match level	Note
↔ 1064129 page in verification queue	UFI	partial	Fleetguard's online catalog lists 1064129 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 11004917 page in verification queue	UFI	partial	Fleetguard's online catalog lists 11004917 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1104146 page in verification queue	UFI	partial	Fleetguard's online catalog lists 1104146 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 112419 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 112419 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 122562 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 122562 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1261815 page in verification queue	UFI	partial	Fleetguard's online catalog lists 1261815 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 12KP854 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 12KP854 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 138398A page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 138398A as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1446691 page in verification queue	UFI	partial	Fleetguard's online catalog lists 1446691 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1455 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 1455 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1456691 page in verification queue	UFI	partial	Fleetguard's online catalog lists 1456691 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1457 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 1457 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 149874A page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 149874A as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 159074 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 159074 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 20664917 page in verification queue	UFI	partial	Fleetguard's online catalog lists 20664917 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 207102 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 207102 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 221669 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 221669 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 22759A1 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 22759A1 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 2304111W page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 2304111W as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 2419050031 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 2419050031 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 2786616 page in verification queue	UFI	partial	Fleetguard's online catalog lists 2786616 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 2811255 page in verification queue	UFI	partial	Fleetguard's online catalog lists 2811255 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 3171169 page in verification queue	UFI	partial	Fleetguard's online catalog lists 3171169 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 3221044000 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 3221044000 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 3285306 page in verification queue	UFI	partial	Fleetguard's online catalog lists 3285306 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 373675 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 373675 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 375995 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 375995 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 375996 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 375996 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 37A6213910 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 37A6213910 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 3800597 page in verification queue	UFI	partial	Fleetguard's online catalog lists 3800597 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 3I0609 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 3I0609 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 3I1909 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 3I1909 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 4118911 page in verification queue	UFI	partial	Fleetguard's online catalog lists 4118911 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 4279889 page in verification queue	UFI	partial	Fleetguard's online catalog lists 4279889 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 4418911 page in verification queue	UFI	partial	Fleetguard's online catalog lists 4418911 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 4700373675 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 4700373675 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 48131202 page in verification queue	UFI	partial	Fleetguard's online catalog lists 48131202 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 5001784 page in verification queue	UFI	partial	Fleetguard's online catalog lists 5001784 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 50SL80DH10SLS000P page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 50SL80DH10SLS000P as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 50SL80DK10 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 50SL80DK10 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 51455	WIX Filters	partial	Fleetguard's online catalog lists 51455 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 51457	WIX Filters	partial	Fleetguard's online catalog lists 51457 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 51668345 page in verification queue	UFI	partial	Fleetguard's online catalog lists 51668345 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 544379HEU page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 544379HEU as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 544379HUS page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 544379HUS as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 544379HUSSYNT page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 544379HUSSYNT as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 551457 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 551457 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 5540903800 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 5540903800 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 58272081 page in verification queue	UFI	partial	Fleetguard's online catalog lists 58272081 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 64133065 page in verification queue	UFI	partial	Fleetguard's online catalog lists 64133065 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 65221 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 65221 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 6630977 page in verification queue	UFI	partial	Fleetguard's online catalog lists 6630977 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 664917 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 664917 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 6661248 page in verification queue	UFI	partial	Fleetguard's online catalog lists 6661248 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 675324280070 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 675324280070 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 700721747 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 700721747 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 700736638 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 700736638 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 70736638 page in verification queue	UFI	partial	Fleetguard's online catalog lists 70736638 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 708333 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 708333 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 77724162 page in verification queue	UFI	partial	Fleetguard's online catalog lists 77724162 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 7X5312 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 7X5312 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 81902001 page in verification queue	UFI	partial	Fleetguard's online catalog lists 81902001 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 819020011 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 819020011 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 8333 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 8333 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 848100086 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 848100086 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 85455 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 85455 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 85457 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 85457 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 8701600 page in verification queue	UFI	partial	Fleetguard's online catalog lists 8701600 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 87588814 page in verification queue	UFI	partial	Fleetguard's online catalog lists 87588814 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 87682682 page in verification queue	UFI	partial	Fleetguard's online catalog lists 87682682 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 87707947 page in verification queue	UFI	partial	Fleetguard's online catalog lists 87707947 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 87707948 page in verification queue	UFI	partial	Fleetguard's online catalog lists 87707948 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 8E66520422 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 8E66520422 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 920019190 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 920019190 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 920788 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 920788 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 92455 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 92455 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 92457 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 92457 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 933429 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 933429 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 944018Q page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 944018Q as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 944022Q	Parker	partial	Fleetguard's online catalog lists 944022Q as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 944030Q	Parker	partial	Fleetguard's online catalog lists 944030Q as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 944032Q	Parker	partial	Fleetguard's online catalog lists 944032Q as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 944099Q page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 944099Q as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ AM879740 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists AM879740 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ AN203010 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists AN203010 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ BF1100 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists BF1100 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ BFKBE page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists BFKBE as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ BT748 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists BT748 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ BT8840-MPG	Baldwin Filters	partial	Fleetguard's online catalog lists BT8840MPG as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ BT8842-MPG	Baldwin Filters	partial	Fleetguard's online catalog lists BT8842MPG as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ BT8842-MPG	Baldwin Filters	partial	Baldwin's Form 561 Number-Finder cross-reference lists HF6550 (FLEETGUARD) as replaced by Baldwin BT8842-MPG. Form/fit listing without published performance data — verify micron grade, collapse rating and seal configuration before substituting.
↔ CG46CC16 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists CG46CC16 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ HF0655000 page in verification queue	Fleetguard	partial	Fleetguard's online catalog lists HF0655000 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ HF164375 page in verification queue	Fleetguard	partial	Fleetguard's online catalog lists HF164375 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ HF165354 page in verification queue	Fleetguard	partial	Fleetguard's online catalog lists HF165354 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ HF717 page in verification queue	Fleetguard	partial	Fleetguard's online catalog lists HF717 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ HF859 page in verification queue	Fleetguard	partial	Fleetguard's online catalog lists HF859 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ L455 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists L455 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ L457 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists L457 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ LA322104400 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists LA322104400 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ LFH4959 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists LFH4959 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ LFP2546 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists LFP2546 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ LG506582 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists LG506582 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ LVA10419 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists LVA10419 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ M6661248 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists M6661248 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P164375	Donaldson	partial	Fleetguard's online catalog lists P164375 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P164376 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P164376 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P165354	Donaldson	partial	Fleetguard's online catalog lists P165354 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P173736 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P173736 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P176565 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P176565 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P472281 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P472281 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P6880 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P6880 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P6881 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P6881 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P761064 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P761064 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PF6030 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists PF6030 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PM11652A page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists PM11652A as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PSH616 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists PSH616 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ RE69054 page in verification queue	STAUFF	partial	Fleetguard's online catalog lists RE69054 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ SH66119 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists SH66119 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ SH66354 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists SH66354 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ SQC00133 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists SQC00133 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ TST006600118 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists TST006600118 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ WGH6552 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists WGH6552 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ WH9453 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists WH9453 as an interchange for HF6550. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ X6661248 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists X6661248 as an interchange for HF6550. 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 HF6550 model number is decoded

HF6550Fleetguard HF-series hydraulic spin-on filter part number.
153.67 mmOverall height.
97.89 mmLargest outside diameter.
1.00 3/8-12 UNF-2BSpin-on mounting thread.
TWA 1 µm at β=2 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 HF6550 filter element?

The published envelope is 97.89 mm OD × 153.67 mm length (3.854 × 6.050 in). Confirm against the housing drawing before ordering.

What micron rating does HF6550 use?

This element is rated 1 µm (nominal class) — TWA 1 µm at β=2 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 HF6550 filter element?

125 partial match(es) requiring parameter review

How do I read the HF6550 part number?

See the designation decoder above: each segment of HF6550 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 98×154 mm envelope. Envelope match alone does not guarantee interchangeability — compare micron/Beta, seals and collapse rating.

HF28892 Fleetguard · 3 µm HF6517 Fleetguard HF6552 Fleetguard · 3 µm HF6554 Fleetguard · 7 µm HF6560 Fleetguard · 3 µm HF6562 Fleetguard · 6 µm HF6566 Fleetguard · 15 µm HF6568 Fleetguard · 25 µm HF6572 Fleetguard · 6 µm HF6574 Fleetguard · 9 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.