Fleetguard · HF Hydraulic · return line
HF6781 filter element: specifications & equivalents
The HF6781 is a Fleetguard return-line hydraulic filter element, built with microglass media, sized 128.93 × 170.41 mm OD × length, rated at 21 µm absolute (21 µm at β75(c); 23 µm at β200(c) per ISO 16889). Verify against the current manufacturer data sheet before ordering.
Envelope OD × L 128.93 × 170.41 mm
Filtration rating 21 µm abs.
Beta rating 21 µm at β75(c); 23 µm at β200(c) per ISO 16889
Media Microglass
Thread 1.00 1/2-16 UN-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 |
| Media | Microglass |
| Filtration rating | 21 µm |
| Rating basis | absolute |
| Beta ratio | 21 µm at β75(c); 23 µm at β200(c) per ISO 16889 |
| Outside diameter OD | 128.93 mm |
| Length | 170.41 mm |
| Thread / connection | 1.00 1/2-16 UN-2B |
| End caps | spin-on baseplate with attached gasket |
| Flow direction | outside-in |
| Integral bypass valve | none (housing/valve-dependent) |
| Manufacturer part no. | HF6781 |
| 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 | 128.93 mm (5.076 in) |
| Overall length | 170.41 mm (6.709 in) |
All 129×170 mm interchange elements →
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
|
↔ 10SL140H20 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 10SL140H20 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 10SL140H25 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 10SL140H25 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 12597989 page in verification queue | UFI | partial | Fleetguard's online catalog lists 12597989 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 160MA020BN page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 160MA020BN as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 167500H20LL113RP page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 167500H20LL113RP as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 167500RH20SLS000P page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 167500RH20SLS000P as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 1740 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 1740 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 2059437 page in verification queue | UFI | partial | Fleetguard's online catalog lists 2059437 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ 51740 | WIX Filters | partial | Fleetguard's online catalog lists 51740 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 7160164 page in verification queue | UFI | partial | Fleetguard's online catalog lists 7160164 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 7160174 page in verification queue | UFI | partial | Fleetguard's online catalog lists 7160174 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 7621446 page in verification queue | UFI | partial | Fleetguard's online catalog lists 7621446 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 84140 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 84140 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 85740 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 85740 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 92740 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 92740 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 928767Q page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 928767Q as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 9313160 page in verification queue | UFI | partial | Fleetguard's online catalog lists 9313160 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 9327084 page in verification queue | UFI | partial | Fleetguard's online catalog lists 9327084 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ A150G25 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists A150G25 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ AC9990FSUJH page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists AC9990FSUJH as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ ARH0475LB20 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists ARH0475LB20 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ BT8309-MPG | Baldwin Filters | partial | Baldwin's Form 561 Number-Finder cross-reference lists HF6781 (FLEETGUARD) as replaced by Baldwin BT8309-MPG. Form/fit listing without published performance data — verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ CA301AFV1 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists CA301AFV1 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ CA401FV1 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists CA401FV1 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ CS0628H page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists CS0628H as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ CSG100A25 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists CSG100A25 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ CSG100A25A page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists CSG100A25A as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ DE0211B1R20 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists DE0211B1R20 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ DMS11TN page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists DMS11TN as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ E12597989 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists E12597989 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ ESF21NFD page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists ESF21NFD as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ F4E050JCB page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists F4E050JCB as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ FA57CC25 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists FA57CC25 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ FPE5020G page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists FPE5020G as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HC7500SDT4H page in verification queue | Pall | partial | Fleetguard's online catalog lists HC7500SDT4H as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HC7500SKT4H page in verification queue | Pall | partial | Fleetguard's online catalog lists HC7500SKT4H as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
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↔ HC7500SUT4H page in verification queue | Pall | partial | Fleetguard's online catalog lists HC7500SUT4H as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
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↔ HC9500SUT4H page in verification queue | Pall | partial | Fleetguard's online catalog lists HC9500SUT4H as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HF0678100 page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF0678100 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HF990 page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF990 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HP75L425MB page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists HP75L425MB as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ LFH5015 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists LFH5015 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ M10G1087 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists M10G1087 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ MF0058063 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists MF0058063 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ P7253 page in verification queue | Donaldson | partial | Fleetguard's online catalog lists P7253 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ P7523 page in verification queue | Donaldson | partial | Fleetguard's online catalog lists P7523 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ P7562 page in verification queue | Donaldson | partial | Fleetguard's online catalog lists P7562 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ PF2178 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists PF2178 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ PLU10671000 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists PLU10671000 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ PR3961 page in verification queue | Parker | partial | Fleetguard's online catalog lists PR3961 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ R750H0425A page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists R750H0425A as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ RE45864 page in verification queue | STAUFF | partial | Fleetguard's online catalog lists RE45864 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ SBF-7500-4Z25B | Schroeder Industries | partial | Fleetguard's online catalog lists SBF75004Z25B as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SF590MG page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SF590MG as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ SF-6728-MG | STAUFF | partial | Fleetguard's online catalog lists SF6728MG as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ SF-6730-MG | STAUFF | partial | STAUFF Filter Interchange lists HF 6781 (FLEETGUARD / CUMMINS) as replaced by SF-6730-MG. Envelope dimensions are published; media grade and performance data are not — confirm before substituting in cleanliness-critical circuits. |
|
↔ ST2852 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists ST2852 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ V0211B1C20 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists V0211B1C20 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ V0211B1R20 | Eaton / Internormen | partial | Fleetguard's online catalog lists V0211B1R20 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ V0211B1V20 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists V0211B1V20 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ ZGCE25 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists ZGCE25 as an interchange for HF6781. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ ZSE25 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists ZSE25 as an interchange for HF6781. 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 HF6781 model number is decoded
- HF6781Fleetguard HF-series hydraulic spin-on filter part number.
- 170.41 mmOverall height.
- 128.93 mmLargest outside diameter.
- 1.00 1/2-16 UN-2BSpin-on mounting thread.
- 21 µm at β75(c); 23 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).
- 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 HF6781 filter element?
The published envelope is 128.93 mm OD × 170.41 mm length (5.076 × 6.709 in). Confirm against the housing drawing before ordering.
What micron rating does HF6781 use?
This element is rated 21 µm absolute — 21 µm at β75(c); 23 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 HF6781 filter element?
62 partial match(es) requiring parameter review
How do I read the HF6781 part number?
See the designation decoder above: each segment of HF6781 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 26 catalog element(s) share the 129×170 mm envelope. Envelope match alone does not guarantee interchangeability — compare micron/Beta, seals and collapse rating.
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.