Fleetguard · HF Hydraulic · inline line
HF7981 filter element: specifications & equivalents
The HF7981 is a Fleetguard inline-line hydraulic filter element, rated at 51.2 µm absolute (51.2 µm at β75(c) per ISO 16889). Verify against the current manufacturer data sheet before ordering.
Inside diameter 41 mm
Filtration rating 51.2 µm abs.
Beta rating 51.2 µm at β75(c) per ISO 16889
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 | 51.2 µm |
| Rating basis | absolute |
| Beta ratio | 51.2 µm at β75(c) per ISO 16889 |
| Outside diameter OD | 70 mm |
| Inside diameter ID | 41 mm |
| End caps | open-ended cartridge element |
| Integral bypass valve | none (housing/valve-dependent) |
| Manufacturer part no. | HF7981 |
| 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 | 70 mm (2.756 in) |
| Inside diameter | 41 mm (1.614 in) |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
|
↔ 121706 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 121706 as an interchange for HF7981. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 21967 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 21967 as an interchange for HF7981. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 221174 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 221174 as an interchange for HF7981. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 4102506 page in verification queue | UFI | partial | Fleetguard's online catalog lists 4102506 as an interchange for HF7981. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 50715 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 50715 as an interchange for HF7981. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 85807055 page in verification queue | UFI | partial | Fleetguard's online catalog lists 85807055 as an interchange for HF7981. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 92073E page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 92073E as an interchange for HF7981. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ FD11P10 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists FD11P10 as an interchange for HF7981. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ HD770 | MANN-FILTER | partial | MANN-FILTER's online catalog lists HF7981 (FLEETGUARD/CUMMINS FILTRATION) as a comparison number for HD770. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ HD770 | MANN-FILTER | partial | Fleetguard's online catalog lists HD770 as an interchange for HF7981. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HF0798100 page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF0798100 as an interchange for HF7981. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HF0798100JX page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF0798100JX as an interchange for HF7981. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ MDH2586 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists MDH2586 as an interchange for HF7981. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ P760155 page in verification queue | Donaldson | partial | Fleetguard's online catalog lists P760155 as an interchange for HF7981. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ PT9248 | Baldwin Filters | partial | Fleetguard's online catalog lists PT9248 as an interchange for HF7981. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ PT9248 | Baldwin Filters | partial | Baldwin's Form 561 Number-Finder cross-reference lists HF7981 (FLEETGUARD) as replaced by Baldwin PT9248. Form/fit listing without published performance data — verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SH50715 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SH50715 as an interchange for HF7981. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ W02AP292 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists W02AP292 as an interchange for HF7981. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ WG292 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists WG292 as an interchange for HF7981. 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 HF7981 model number is decoded
- HF7981Fleetguard HF-series hydraulic cartridge element part number.
- 70 mmLargest outside diameter.
- 41 mmLargest end inside diameter.
- 51.2 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 micron rating does HF7981 use?
This element is rated 51.2 µm absolute — 51.2 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 HF7981 filter element?
19 partial match(es) requiring parameter review
How do I read the HF7981 part number?
See the designation decoder above: each segment of HF7981 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.
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.