Fleetguard · HF Hydraulic · inline line
HF35121 filter element: specifications & equivalents
The HF35121 is a Fleetguard inline-line hydraulic filter element, sized 72 × 300 mm OD × length (ID 8.4 mm), rated at 10 µm absolute (10 µm at β75(c); 11 µm at β200(c) per ISO 16889). Verify against the current manufacturer data sheet before ordering.
Envelope OD × L 72 × 300 mm
Inside diameter 8.4 mm
Filtration rating 10 µm abs.
Beta rating 10 µm at β75(c); 11 µm at β200(c) per ISO 16889
Collapse / burst 8 bar
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 |
| Filtration rating | 10 µm |
| Rating basis | absolute |
| Beta ratio | 10 µm at β75(c); 11 µm at β200(c) per ISO 16889 |
| Outside diameter OD | 72 mm |
| Inside diameter ID | 8.4 mm |
| Length | 300 mm |
| End caps | open-ended cartridge element |
| Rated flow | 125 L/min |
| Collapse / burst pressure | 8 bar |
| Integral bypass valve | none (housing/valve-dependent) |
| Manufacturer part no. | HF35121 |
| 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 | 72 mm (2.835 in) |
| Inside diameter | 8.4 mm (0.331 in) |
| Overall length | 300 mm (11.811 in) |
All 72×300 mm interchange elements →
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
|
↔ 1713844 page in verification queue | UFI | partial | Fleetguard's online catalog lists 1713844 as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 3607792 page in verification queue | UFI | partial | Fleetguard's online catalog lists 3607792 as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 4653816 page in verification queue | UFI | partial | Fleetguard's online catalog lists 4653816 as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 4653916 page in verification queue | UFI | partial | Fleetguard's online catalog lists 4653916 as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 58100012 page in verification queue | UFI | partial | Fleetguard's online catalog lists 58100012 as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 70385628 page in verification queue | UFI | partial | Fleetguard's online catalog lists 70385628 as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 937784Q page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 937784Q as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 94237 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 94237 as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ CRS16002 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists CRS16002 as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ HD7033 | MANN-FILTER | partial | MANN-FILTER's online catalog lists HF35121 (FLEETGUARD/CUMMINS FILTRATION) as a comparison number for HD7033. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HHC01700 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists HHC01700 as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HY24112 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists HY24112 as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HY2838 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists HY2838 as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ LH22142 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists LH22142 as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ MF0063423 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists MF0063423 as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ MR1004A10A page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists MR1004A10A as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ P171825 page in verification queue | Donaldson | partial | Fleetguard's online catalog lists P171825 as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ PT9479-MPG | Baldwin Filters | partial | Fleetguard's online catalog lists PT9479MPG as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ PT9479-MPG | Baldwin Filters | partial | Baldwin's Form 561 Number-Finder cross-reference lists HF35121 (FLEETGUARD) as replaced by Baldwin PT9479-MPG. Form/fit listing without published performance data — verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ R06D10G page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists R06D10G as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ R714G10P page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists R714G10P as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ RA-180-E-10-B | STAUFF | partial | Fleetguard's online catalog lists RA180E10B as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ RC140FD1 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists RC140FD1 as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ RFC7101210GV page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists RFC7101210GV as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SFTXW11212UM page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SFTXW11212UM as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SH53325 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SH53325 as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ TXW3E10B page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists TXW3E10B as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ TXW3E10BQA page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists TXW3E10BQA as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ TXW3ECC10 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists TXW3ECC10 as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ TXW3EGDL10 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists TXW3EGDL10 as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ TXW3ERCC10 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists TXW3ERCC10 as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ TXW3ERGDL10 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists TXW3ERGDL10 as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ TXW3ERN2010 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists TXW3ERN2010 as an interchange for HF35121. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ WGTW3ECC10 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists WGTW3ECC10 as an interchange for HF35121. 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 HF35121 model number is decoded
- HF35121Fleetguard HF-series hydraulic cartridge element part number.
- 300 mmOverall height.
- 72 mmLargest outside diameter.
- 8.4 mmLargest end inside diameter.
- 10 µm at β75(c); 11 µm at β200(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 HF35121 filter element?
The published envelope is 72 mm OD × 300 mm length with a 8.4 mm inside diameter (2.835 × 11.811 in × 0.331 in ID). Confirm against the housing drawing before ordering.
What micron rating does HF35121 use?
This element is rated 10 µm absolute — 10 µm at β75(c); 11 µm at β200(c) 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 HF35121 filter element?
34 partial match(es) requiring parameter review
How do I read the HF35121 part number?
See the designation decoder above: each segment of HF35121 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 13 catalog element(s) share the 72×300 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.