Fleetguard · HF Hydraulic · return line
HF6188 filter element: specifications & equivalents
The HF6188 is a Fleetguard return-line hydraulic filter element, sized 96 × 168 mm OD × length, rated at 35 µm class (TWA 35 µm at β=2 per ISO 16889). Verify against the current manufacturer data sheet before ordering.
Envelope OD × L 96 × 168 mm
Filtration rating 35 µm nom.
Beta rating TWA 35 µm at β=2 per ISO 16889
Thread 1.00 1/8-16 UN-2B
Line type return
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 | return line |
| Filtration rating | 35 µm |
| Rating basis | nominal |
| Beta ratio | TWA 35 µm at β=2 per ISO 16889 |
| Outside diameter OD | 96 mm |
| Length | 168 mm |
| Thread / connection | 1.00 1/8-16 UN-2B |
| End caps | spin-on baseplate with attached gasket |
| Flow direction | outside-in |
| Integral bypass valve | none (housing/valve-dependent) |
| Manufacturer part no. | HF6188 |
| 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 | 96 mm (3.780 in) |
| Overall length | 168 mm (6.614 in) |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
|
↔ 175111A page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 175111A as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 1778 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 1778 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 1863229 page in verification queue | UFI | partial | Fleetguard's online catalog lists 1863229 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 2018 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 2018 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 340500480 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 340500480 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 47622189 page in verification queue | UFI | partial | Fleetguard's online catalog lists 47622189 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ 51778 | WIX Filters | partial | Fleetguard's online catalog lists 51778 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 551778 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 551778 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 76539 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 76539 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 81863229 page in verification queue | UFI | partial | Fleetguard's online catalog lists 81863229 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 83984236 page in verification queue | UFI | partial | Fleetguard's online catalog lists 83984236 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 84263773 page in verification queue | UFI | partial | Fleetguard's online catalog lists 84263773 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 85778 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 85778 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 92778 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 92778 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 9315 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 9315 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 9455085009 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 9455085009 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 954SH page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 954SH as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
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↔ 986B01907 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 986B01907 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ AP3626 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists AP3626 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ AZH440 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists AZH440 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
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↔ BP618 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists BP618 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ BT8357 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists BT8357 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ CS1440H page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists CS1440H as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ D10026160 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists D10026160 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ D6NNB486A page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists D6NNB486A as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
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↔ F0NNB486AA page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists F0NNB486AA as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
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↔ FR16010 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists FR16010 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HDS486 page in verification queue | MANN-FILTER | partial | Fleetguard's online catalog lists HDS486 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
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↔ HF0618800 page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF0618800 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
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↔ HF0618800JX page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF0618800JX as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HF3061 page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF3061 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HSM6172 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists HSM6172 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
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↔ HSN6172 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists HSN6172 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ L1778 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists L1778 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ LFH4926 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists LFH4926 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ LFH8243 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists LFH8243 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ LK3626 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists LK3626 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ P172882 page in verification queue | Donaldson | partial | Fleetguard's online catalog lists P172882 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ P4637 page in verification queue | Donaldson | partial | Fleetguard's online catalog lists P4637 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ P4637A page in verification queue | Donaldson | partial | Fleetguard's online catalog lists P4637A as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ P5469 page in verification queue | Donaldson | partial | Fleetguard's online catalog lists P5469 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ P552409 page in verification queue | Donaldson | partial | Fleetguard's online catalog lists P552409 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ PERI243 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists PERI243 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ PS486 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists PS486 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ PSH486 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists PSH486 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SH56238 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SH56238 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SH59010 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SH59010 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ W10005 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists W10005 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ W9508 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists W9508 as an interchange for HF6188. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ WOH769 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists WOH769 as an interchange for HF6188. 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 HF6188 model number is decoded
- HF6188Fleetguard HF-series hydraulic spin-on filter part number.
- 168 mmOverall height.
- 96 mmLargest outside diameter.
- 1.00 1/8-16 UN-2BSpin-on mounting thread.
- TWA 35 µm at β=2 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
- A return-line element is not a pressure-line element: return cartridges (BN4HC low-collapse) tolerate roughly 20 bar differential, while BH4HC pressure executions are rated to 210 bar. Installing a low-collapse element in a pressure housing can rupture the media on cold-start spikes.
- This element has no integral bypass — opening pressure is set by the housing’s reusable bypass valve. Confirm the valve setting (commonly 3.4 bar) is present before fitting.
- “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 HF6188 filter element?
The published envelope is 96 mm OD × 168 mm length (3.780 × 6.614 in). Confirm against the housing drawing before ordering.
What micron rating does HF6188 use?
This element is rated 35 µm (nominal class) — TWA 35 µm at β=2 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 HF6188 filter element?
50 partial match(es) requiring parameter review
How do I read the HF6188 part number?
See the designation decoder above: each segment of HF6188 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.