Fleetguard · HF Hydraulic · inline line
HF29121 filter element: specifications & equivalents
The HF29121 is a Fleetguard inline-line hydraulic filter element, built with microglass media, sized 56.39 × 210.57 mm OD × length (ID 25.4 mm). 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 |
| Media | Microglass |
| Beta ratio | 4 µm at β200(c); 4.8 µm at β1000(c) per ISO 16889 |
| Outside diameter OD | 56.39 mm |
| Inside diameter ID | 25.4 mm |
| Length | 210.57 mm |
| End caps | open-ended cartridge element |
| Collapse / burst pressure | 10.3421 bar |
| Integral bypass valve | none (housing/valve-dependent) |
| Manufacturer part no. | HF29121 |
| 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 | 56.39 mm (2.220 in) |
| Inside diameter | 25.4 mm (1.000 in) |
| Overall length | 210.57 mm (8.290 in) |
All 56×211 mm interchange elements →
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
|
↔ 2956257 page in verification queue | UFI | partial | Fleetguard's online catalog lists 2956257 as an interchange for HF29121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HY13816 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists HY13816 as an interchange for HF29121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SH75309 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SH75309 as an interchange for HF29121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SH75309SP page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SH75309SP as an interchange for HF29121. 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 HF29121 model number is decoded
- HF29121Fleetguard HF-series hydraulic cartridge element part number.
- 210.57 mmOverall height.
- 56.39 mmLargest outside diameter.
- 25.4 mmLargest end inside diameter.
- 4 µm at β200(c); 4.8 µm at β1000(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 HF29121 filter element?
What replaces the HF29121 filter element?
How do I read the HF29121 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 56×211 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.