Fleetguard · HF Hydraulic · inline line
HF6251 filter element: specifications & equivalents
The HF6251 is a Fleetguard inline-line hydraulic filter element, rated at 140 µm absolute (140 µm at β75(c) per ISO 16889). Verify against the current manufacturer data sheet before ordering.
Inside diameter 66.8 mm
Filtration rating 140 µm abs.
Beta rating 140 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 | 140 µm |
| Rating basis | absolute |
| Beta ratio | 140 µm at β75(c) per ISO 16889 |
| Inside diameter ID | 66.8 mm |
| Length | 135.89 mm |
| End caps | open-ended cartridge element |
| Integral bypass valve | none (housing/valve-dependent) |
| Manufacturer part no. | HF6251 |
| 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.
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
|
↔ 101100 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 101100 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 110100 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 110100 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 1A310 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 1A310 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 2058638 page in verification queue | UFI | partial | Fleetguard's online catalog lists 2058638 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 29501908 page in verification queue | UFI | partial | Fleetguard's online catalog lists 29501908 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 4449K61 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 4449K61 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 4455K13 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 4455K13 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 4910 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 4910 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 4955 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 4955 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 557450 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 557450 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ 57450 | WIX Filters | partial | Fleetguard's online catalog lists 57450 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 7055 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 7055 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 7450 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 7450 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 84450 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 84450 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 91450 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 91450 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 937484 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 937484 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ AAU6006 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists AAU6006 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ AFISE202 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists AFISE202 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ CFSE10 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists CFSE10 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ CFSE10100 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists CFSE10100 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ FS121B5T125 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists FS121B5T125 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ FST1101R0 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists FST1101R0 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ H7055 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists H7055 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HAFS10 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists HAFS10 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HF0625100 page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF0625100 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HI204914 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists HI204914 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
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↔ MSZ2020MCVB10 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists MSZ2020MCVB10 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
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↔ MSZ2020MNB page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists MSZ2020MNB as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ OF30810 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists OF30810 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ P169014 page in verification queue | Donaldson | partial | Fleetguard's online catalog lists P169014 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ PSCN510PV page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists PSCN510PV as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ PT9225 | Baldwin Filters | partial | Fleetguard's online catalog lists PT9225 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SEH101100 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SEH101100 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SF64B100GO page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SF64B100GO as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SFE50G125A10 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SFE50G125A10 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SH56301 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SH56301 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SN10010000 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SN10010000 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SP64B100GR125 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SP64B100GR125 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SS1000 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SS1000 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SS1008N page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SS1008N as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SS100G00 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SS100G00 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SS1100 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SS1100 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SS3105100A100 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SS3105100A100 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ ST100A page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists ST100A as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ STR0704M90G2S page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists STR0704M90G2S as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ STR0704SG2M90 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists STR0704SG2M90 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SU35SF16 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SU35SF16 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SUS105S16 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SUS105S16 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SUS355F16 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SUS355F16 as an interchange for HF6251. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ X250903507 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists X250903507 as an interchange for HF6251. 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 HF6251 model number is decoded
- HF6251Fleetguard HF-series hydraulic cartridge element part number.
- 135.89 mmOverall height.
- 66.8 mmLargest end inside diameter.
- 140 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 HF6251 use?
This element is rated 140 µm absolute — 140 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 HF6251 filter element?
50 partial match(es) requiring parameter review
How do I read the HF6251 part number?
See the designation decoder above: each segment of HF6251 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.