Fleetguard · HF Hydraulic · inline line
HF6166 filter element: specifications & equivalents
The HF6166 is a Fleetguard inline-line hydraulic filter element, rated at 45 µm absolute (45 µm at β75(c) per ISO 16889). Verify against the current manufacturer data sheet before ordering.
Inside diameter 114.3 mm
Filtration rating 45 µm abs.
Beta rating 45 µm at β75(c) per ISO 16889
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 | 45 µm |
| Rating basis | absolute |
| Beta ratio | 45 µm at β75(c) per ISO 16889 |
| Inside diameter ID | 114.3 mm |
| Length | 184.15 mm |
| End caps | open-ended cartridge element |
| Integral bypass valve | none (housing/valve-dependent) |
| Manufacturer part no. | HF6166 |
| 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 |
|---|---|---|---|
|
↔ 1424 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 1424 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 1427 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 1427 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 2024 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 2024 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 4603314 page in verification queue | UFI | partial | Fleetguard's online catalog lists 4603314 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ 51424 | WIX Filters | partial | Fleetguard's online catalog lists 51424 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ 51427 | WIX Filters | partial | Fleetguard's online catalog lists 51427 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 5432670001 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 5432670001 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 543267001 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 543267001 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 543627001 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 543627001 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 54500 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 54500 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 551424 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 551424 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 551427 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 551427 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 5763665125 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 5763665125 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 5763665140 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 5763665140 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 5763667120 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 5763667120 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 626616 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 626616 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 6439483 page in verification queue | UFI | partial | Fleetguard's online catalog lists 6439483 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 667661 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 667661 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 70664000 page in verification queue | UFI | partial | Fleetguard's online catalog lists 70664000 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 70667661 page in verification queue | UFI | partial | Fleetguard's online catalog lists 70667661 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 85424 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 85424 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 85427 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 85427 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 92424 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 92424 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 92427 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 92427 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ C1710 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists C1710 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ FF446 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists FF446 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ FH49 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists FH49 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HEM6074 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists HEM6074 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HF0616600 page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF0616600 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HF0616600JX page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF0616600JX as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HF768 page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF768 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ P164792 page in verification queue | Donaldson | partial | Fleetguard's online catalog lists P164792 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ P450630S6 page in verification queue | Donaldson | partial | Fleetguard's online catalog lists P450630S6 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ P768 page in verification queue | Donaldson | partial | Fleetguard's online catalog lists P768 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ PF844 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists PF844 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ PL507255 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists PL507255 as an interchange for HF6166. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ PT498 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists PT498 as an interchange for HF6166. 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 HF6166 model number is decoded
- HF6166Fleetguard HF-series hydraulic cartridge element part number.
- 184.15 mmOverall height.
- 114.3 mmLargest end inside diameter.
- 45 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 micron rating does HF6166 use?
This element is rated 45 µm absolute — 45 µm at β75(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 HF6166 filter element?
37 partial match(es) requiring parameter review
How do I read the HF6166 part number?
See the designation decoder above: each segment of HF6166 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.