Fleetguard · HF Hydraulic · return line
HF6337 filter element: specifications & equivalents
The HF6337 is a Fleetguard return-line hydraulic filter element, sized 93.5 × 116.5 mm OD × length, rated at 25 µm class (TWA 25 µm at β=2 per ISO 16889). Verify against the current manufacturer data sheet before ordering.
Envelope OD × L 93.5 × 116.5 mm
Filtration rating 25 µm nom.
Beta rating TWA 25 µm at β=2 per ISO 16889
Thread 13/16-16 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 |
| Filtration rating | 25 µm |
| Rating basis | nominal |
| Beta ratio | TWA 25 µm at β=2 per ISO 16889 |
| Outside diameter OD | 93.5 mm |
| Length | 116.5 mm |
| Thread / connection | 13/16-16 UN-2B |
| End caps | spin-on baseplate with attached gasket |
| Flow direction | outside-in |
| Integral bypass valve | none (housing/valve-dependent) |
| Manufacturer part no. | HF6337 |
| 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 | 93.5 mm (3.681 in) |
| Overall length | 116.5 mm (4.587 in) |
All 94×117 mm interchange elements →
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
|
↔ 1209 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 1209 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 1479 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 1479 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 177634 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 177634 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 2161 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 2161 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 3006350 page in verification queue | UFI | partial | Fleetguard's online catalog lists 3006350 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 300635012 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 300635012 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 3621299M1 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 3621299M1 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 3G6337 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 3G6337 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 3G6925 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 3G6925 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 3G6926 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 3G6926 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 3G6928 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 3G6928 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 3G9626 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 3G9626 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 4T7948 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 4T7948 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ 51209 | WIX Filters | partial | Fleetguard's online catalog lists 51209 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ 51479 | WIX Filters | partial | Fleetguard's online catalog lists 51479 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 57282 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 57282 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 6E0924 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 6E0924 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 7282 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 7282 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 84282 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 84282 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 85209 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 85209 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 85479 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 85479 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 92209 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 92209 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 92479 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 92479 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ ABP3002065 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists ABP3002065 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ B328 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists B328 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ BT344-S | Baldwin Filters | partial | Fleetguard's online catalog lists BT344S as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ CS1574H page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists CS1574H as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
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↔ CT6E0924 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists CT6E0924 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
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↔ H20294 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists H20294 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HF0633700 page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF0633700 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HF0633700J page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF0633700 J as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
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↔ HF0633700MX page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF0633700MX as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HF794 page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF794 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HG353WD page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists HG353WD as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HSM6067 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists HSM6067 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ L479 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists L479 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ LF351 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists LF351 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ LFH4937 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists LFH4937 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ LFP2275 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists LFP2275 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
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↔ MCF00321 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists MCF00321 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
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↔ P551324 page in verification queue | Donaldson | partial | Fleetguard's online catalog lists P551324 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ P794 page in verification queue | Donaldson | partial | Fleetguard's online catalog lists P794 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ PER294 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists PER294 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ PF2155 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists PF2155 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ PH3503 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists PH3503 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ PSH167 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists PSH167 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SH56387 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SH56387 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ WD10016 | MANN-FILTER | partial | MANN-FILTER's online catalog lists HF6337 (FLEETGUARD/CUMMINS FILTRATION) as a comparison number for WD10016. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ WD10016 | MANN-FILTER | partial | Fleetguard's online catalog lists WD10016 as an interchange for HF6337. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ WGH6337 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists WGH6337 as an interchange for HF6337. 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 HF6337 model number is decoded
- HF6337Fleetguard HF-series hydraulic spin-on filter part number.
- 116.5 mmOverall height.
- 93.5 mmLargest outside diameter.
- 13/16-16 UN-2BSpin-on mounting thread.
- TWA 25 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).
- 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 HF6337 filter element?
The published envelope is 93.5 mm OD × 116.5 mm length (3.681 × 4.587 in). Confirm against the housing drawing before ordering.
What micron rating does HF6337 use?
This element is rated 25 µm (nominal class) — TWA 25 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 HF6337 filter element?
50 partial match(es) requiring parameter review
How do I read the HF6337 part number?
See the designation decoder above: each segment of HF6337 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 1 catalog element(s) share the 94×117 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.