Fleetguard · HF Hydraulic · inline line
HF7991 filter element: specifications & equivalents
The HF7991 is a Fleetguard inline-line hydraulic filter element, sized 126 × 480 mm OD × length (ID 92 mm), rated at 17 µm absolute (17 µm at β75(c) per ISO 16889). Verify against the current manufacturer data sheet before ordering.
Envelope OD × L 126 × 480 mm
Inside diameter 92 mm
Filtration rating 17 µm abs.
Beta rating 17 µm at β75(c) per ISO 16889
Collapse / burst 8 bar
Line type inline
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 | inline line |
| Filtration rating | 17 µm |
| Rating basis | absolute |
| Beta ratio | 17 µm at β75(c) per ISO 16889 |
| Outside diameter OD | 126 mm |
| Inside diameter ID | 92 mm |
| Length | 480 mm |
| End caps | open-ended cartridge element |
| Rated flow | 500 L/min |
| Collapse / burst pressure | 8 bar |
| Integral bypass valve | none (housing/valve-dependent) |
| Manufacturer part no. | HF7991 |
| 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 | 126 mm (4.961 in) |
| Inside diameter | 92 mm (3.622 in) |
| Overall length | 480 mm (18.898 in) |
All 126×480 mm interchange elements →
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
|
↔ 2291022 page in verification queue | UFI | partial | Fleetguard's online catalog lists 2291022 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 280276 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 280276 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 3000380023H1 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 3000380023H1 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 3373034R22 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 3373034R22 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 4164548 page in verification queue | UFI | partial | Fleetguard's online catalog lists 4164548 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 4272640 page in verification queue | UFI | partial | Fleetguard's online catalog lists 4272640 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 5839HF7991 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 5839HF7991 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 909881 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 909881 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 9223160002 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 9223160002 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 937800Q page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 937800Q as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 943961Q page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 943961Q as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ AFPOVL44 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists AFPOVL44 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ CRC340FV1 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists CRC340FV1 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ CRS49003 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists CRS49003 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ DER171B4C20 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists DER171B4C20 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ ERF34NFD page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists ERF34NFD as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ ERF34NFD1 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists ERF34NFD1 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ FC1099F025BS page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists FC1099F025BS as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ FC1099Q020BS page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists FC1099Q020BS as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ HD13110 | MANN-FILTER | partial | MANN-FILTER's online catalog lists HF7991 (FLEETGUARD/CUMMINS FILTRATION) as a comparison number for HD13110. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HF0799100 page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF0799100 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HF6304HN page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF6304HN as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HHC01590 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists HHC01590 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HI104681 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists HI104681 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HY2876 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists HY2876 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ K000910101 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists K000910101 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ MF0063617 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists MF0063617 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ MR6304A25A page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists MR6304A25A as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ P172468 page in verification queue | Donaldson | partial | Fleetguard's online catalog lists P172468 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ PR4421 page in verification queue | Parker | partial | Fleetguard's online catalog lists PR4421 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ PT9306-MPG | Baldwin Filters | partial | Fleetguard's online catalog lists PT9306MPG as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ PT9306-MPG | Baldwin Filters | partial | Baldwin's Form 561 Number-Finder cross-reference lists HF7991 (FLEETGUARD) as replaced by Baldwin PT9306-MPG. Form/fit listing without published performance data — verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ R732G25 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists R732G25 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ RA-500-E-20-B | STAUFF | partial | Fleetguard's online catalog lists RA500E20B as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ RC340FV1 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists RC340FV1 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ RFC7301925GV page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists RFC7301925GV as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ RFC7301925GVW page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists RFC7301925GVW as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SH53003 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SH53003 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ ST7991 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists ST7991 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ TX40EAL202N5 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists TX40EAL202N5 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ TXW8C20B page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists TXW8C20B as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ TXW8CCC25 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists TXW8CCC25 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ TXW8CGD20 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists TXW8CGD20 as an interchange for HF7991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ TXW8CGDL20 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists TXW8CGDL20 as an interchange for HF7991. 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 HF7991 model number is decoded
- HF7991Fleetguard HF-series hydraulic cartridge element part number.
- 480 mmOverall height.
- 126 mmLargest outside diameter.
- 92 mmLargest end inside diameter.
- 17 µm at β75(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
- “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).
- 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 HF7991 filter element?
The published envelope is 126 mm OD × 480 mm length with a 92 mm inside diameter (4.961 × 18.898 in × 3.622 in ID). Confirm against the housing drawing before ordering.
What micron rating does HF7991 use?
This element is rated 17 µm absolute — 17 µm at β75(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 HF7991 filter element?
44 partial match(es) requiring parameter review
How do I read the HF7991 part number?
See the designation decoder above: each segment of HF7991 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 126×480 mm envelope. Envelope match alone does not guarantee interchangeability — compare micron/Beta, seals and collapse rating.
HF29243 HF6311 HF7964 HD13110 RA-500-E-03-B RA-500-E-05-B RA-500-E-10-B RA-500-E-20-B RA-500-L-10-B 57389
Other models in the HF Hydraulic series
All 2621 →Reviewed & verified by the ElementRef engineering desk against Cummins Filtration / Fleetguard on 2026-09-28. Read our editorial & correction policy.