Fleetguard · HF Hydraulic · inline line
HF6421 filter element: specifications & equivalents
The HF6421 is a Fleetguard inline-line hydraulic filter element, sized 188.98 × 461.01 mm OD × length, rated at 20 µm absolute (20 µm at β75(c) per ISO 16889). Verify against the current manufacturer data sheet before ordering.
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 | 20 µm |
| Rating basis | absolute |
| Beta ratio | 20 µm at β75(c) per ISO 16889 |
| Outside diameter OD | 188.98 mm |
| Length | 461.01 mm |
| End caps | open-ended cartridge element |
| Integral bypass valve | none (housing/valve-dependent) |
| Manufacturer part no. | HF6421 |
| 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 | 188.98 mm (7.440 in) |
| Overall length | 461.01 mm (18.150 in) |
All 189×461 mm interchange elements →
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
|
↔ 1015077 page in verification queue | UFI | partial | Fleetguard's online catalog lists 1015077 as an interchange for HF6421. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 2560232 page in verification queue | UFI | partial | Fleetguard's online catalog lists 2560232 as an interchange for HF6421. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 25602327 page in verification queue | UFI | partial | Fleetguard's online catalog lists 25602327 as an interchange for HF6421. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ C7547 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists C7547 as an interchange for HF6421. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HF0642100 page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF0642100 as an interchange for HF6421. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ M2560232 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists M2560232 as an interchange for HF6421. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ P161632 page in verification queue | Donaldson | partial | Fleetguard's online catalog lists P161632 as an interchange for HF6421. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ V7547 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists V7547 as an interchange for HF6421. 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 HF6421 model number is decoded
- HF6421Fleetguard HF-series hydraulic cartridge element part number.
- 461.01 mmOverall height.
- 188.98 mmLargest outside diameter.
- 20 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 are the dimensions of the HF6421 filter element?
What micron rating does HF6421 use?
What replaces the HF6421 filter element?
How do I read the HF6421 part number?
Is a same-envelope aftermarket element always a drop-in replacement?
How often should a hydraulic return-line element be replaced?
Same-envelope elements from other brands
View full interchange →These 1 catalog element(s) share the 189×461 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.