Fleetguard · HF Hydraulic · return line
HF6538 filter element: specifications & equivalents
The HF6538 is a Fleetguard return-line hydraulic filter element, sized 93.47 × 205.49 mm OD × length. Verify against the current manufacturer data sheet before ordering.
Envelope OD × L 93.47 × 205.49 mm
Thread 3/4-14 BSP
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 |
| Outside diameter OD | 93.47 mm |
| Length | 205.49 mm |
| Thread / connection | 3/4-14 BSP |
| End caps | spin-on baseplate with attached gasket |
| Flow direction | outside-in |
| Integral bypass valve | none (housing/valve-dependent) |
| Manufacturer part no. | HF6538 |
| 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 | 93.47 mm (3.680 in) |
| Overall length | 205.49 mm (8.090 in) |
All 93×205 mm interchange elements →
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
|
↔ 3668164M91 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 3668164M91 as an interchange for HF6538. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 4204121M1 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 4204121M1 as an interchange for HF6538. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 51693106 page in verification queue | UFI | partial | Fleetguard's online catalog lists 51693106 as an interchange for HF6538. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 662027 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 662027 as an interchange for HF6538. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 7720812P25 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 7720812P25 as an interchange for HF6538. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 8000600 page in verification queue | UFI | partial | Fleetguard's online catalog lists 8000600 as an interchange for HF6538. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 912019900 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 912019900 as an interchange for HF6538. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 9976453 page in verification queue | UFI | partial | Fleetguard's online catalog lists 9976453 as an interchange for HF6538. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 9976807 page in verification queue | UFI | partial | Fleetguard's online catalog lists 9976807 as an interchange for HF6538. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ A03A25C page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists A03A25C as an interchange for HF6538. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ A111C25 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists A111C25 as an interchange for HF6538. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ BT8474 | Baldwin Filters | partial | Fleetguard's online catalog lists BT8474 as an interchange for HF6538. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ CA152CV1 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists CA152CV1 as an interchange for HF6538. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ CA803 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists CA803 as an interchange for HF6538. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ CCA152ECV1 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists CCA152ECV1 as an interchange for HF6538. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ CS070P25A page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists CS070P25A as an interchange for HF6538. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ ESE12NCD page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists ESE12NCD as an interchange for HF6538. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ FD32P25 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists FD32P25 as an interchange for HF6538. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HC7974 page in verification queue | Pall | partial | Fleetguard's online catalog lists HC7974 as an interchange for HF6538. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HEK4520180ASP025 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists HEK4520180ASP025 as an interchange for HF6538. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HF0653800 page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF0653800 as an interchange for HF6538. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HF0653800JX page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF0653800JX as an interchange for HF6538. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HY819W page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists HY819W as an interchange for HF6538. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ P171611 page in verification queue | Donaldson | partial | Fleetguard's online catalog lists P171611 as an interchange for HF6538. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SOE625 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SOE625 as an interchange for HF6538. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ WD10005 | MANN-FILTER | partial | MANN-FILTER's online catalog lists HF 6538 (FLEETGUARD/CUMMINS FILTRATION) as a comparison number for WD10005. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ WD10005 | MANN-FILTER | partial | Fleetguard's online catalog lists WD10005 as an interchange for HF6538. 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 HF6538 model number is decoded
- HF6538Fleetguard HF-series hydraulic spin-on filter part number.
- 205.49 mmOverall height.
- 93.47 mmLargest outside diameter.
- 3/4-14 BSPSpin-on mounting thread.
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 HF6538 filter element?
The published envelope is 93.47 mm OD × 205.49 mm length (3.680 × 8.090 in). Confirm against the housing drawing before ordering.
What replaces the HF6538 filter element?
27 partial match(es) requiring parameter review
How do I read the HF6538 part number?
See the designation decoder above: each segment of HF6538 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 8 catalog element(s) share the 93×205 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.