Fleetguard · HF Hydraulic · inline line
HF35021 filter element: specifications & equivalents
The HF35021 is a Fleetguard inline-line hydraulic filter element. Verify against the current manufacturer data sheet before ordering.
Inside diameter 111.12 mm
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 |
| Inside diameter ID | 111.12 mm |
| Length | 407.59 mm |
| End caps | open-ended cartridge element |
| Integral bypass valve | none (housing/valve-dependent) |
| Manufacturer part no. | HF35021 |
| 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 |
|---|---|---|---|
|
↔ 1439 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 1439 as an interchange for HF35021. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ 51439 | WIX Filters | partial | Fleetguard's online catalog lists 51439 as an interchange for HF35021. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 551439 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 551439 as an interchange for HF35021. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 7437000176 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 7437000176 as an interchange for HF35021. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 85439 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 85439 as an interchange for HF35021. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 92439 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 92439 as an interchange for HF35021. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ C7390 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists C7390 as an interchange for HF35021. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ P164699 | Donaldson | partial | Fleetguard's online catalog lists P164699 as an interchange for HF35021. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ PT9340-MPG | Baldwin Filters | partial | Fleetguard's online catalog lists PT9340MPG as an interchange for HF35021. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ PT9340-MPG | Baldwin Filters | partial | Baldwin's Form 561 Number-Finder cross-reference lists HF35021 (FLEETGUARD) as replaced by Baldwin PT9340-MPG. Form/fit listing without published performance data — 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 HF35021 model number is decoded
- HF35021Fleetguard HF-series hydraulic cartridge element part number.
- 407.59 mmOverall height.
- 111.12 mmLargest end inside diameter.
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 replaces the HF35021 filter element?
10 partial match(es) requiring parameter review
How do I read the HF35021 part number?
See the designation decoder above: each segment of HF35021 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.