Fleetguard · HF Hydraulic · return line
HF6601 filter element: specifications & equivalents
The HF6601 is a Fleetguard return-line hydraulic filter element, sized 93.47 × 203.96 mm OD × length, rated at 1 µm class (TWA 1 µm at β=2 per ISO 16889). Verify against the current manufacturer data sheet before ordering.
Envelope OD × L 93.47 × 203.96 mm
Filtration rating 1 µm nom.
Beta rating TWA 1 µm at β=2 per ISO 16889
Thread 1.00 1/2-16 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 | 1 µm |
| Rating basis | nominal |
| Beta ratio | TWA 1 µm at β=2 per ISO 16889 |
| Outside diameter OD | 93.47 mm |
| Length | 203.96 mm |
| Thread / connection | 1.00 1/2-16 UN-2B |
| End caps | spin-on baseplate with attached gasket |
| Flow direction | outside-in |
| Integral bypass valve | none (housing/valve-dependent) |
| Manufacturer part no. | HF6601 |
| 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 | 93.47 mm (3.680 in) |
| Overall length | 203.96 mm (8.030 in) |
All 93×204 mm interchange elements →
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
|
↔ 1046Z290 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 1046Z290 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 1046Z593 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 1046Z593 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 1046Z595 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 1046Z595 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 1200815 page in verification queue | UFI | partial | Fleetguard's online catalog lists 1200815 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 1202 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 1202 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 149661 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 149661 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 223479 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 223479 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 25012646 page in verification queue | UFI | partial | Fleetguard's online catalog lists 25012646 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 30202 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 30202 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 3I1510 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 3I1510 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 3T8642 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 3T8642 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 4003058 page in verification queue | UFI | partial | Fleetguard's online catalog lists 4003058 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 4700223479 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 4700223479 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 51202 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 51202 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 551120 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 551120 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 561980C1 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 561980C1 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 562871C91 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 562871C91 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 697130 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 697130 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 70208 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 70208 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 8320237 page in verification queue | UFI | partial | Fleetguard's online catalog lists 8320237 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 85202 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 85202 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 92202 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 92202 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 9904103228 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 9904103228 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ BT372-10 | Baldwin Filters | partial | Fleetguard's online catalog lists BT37210 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ BT372-10 | Baldwin Filters | partial | Baldwin's Form 561 Number-Finder cross-reference lists HF6601 (FLEETGUARD) as replaced by Baldwin BT372-10. Form/fit listing without published performance data — verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ D416347 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists D416347 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ F4F040BCB page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists F4F040BCB as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HC7400FUJ8H page in verification queue | Pall | partial | Fleetguard's online catalog lists HC7400FUJ8H as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
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↔ HC7400SUJ8H page in verification queue | Pall | partial | Fleetguard's online catalog lists HC7400SUJ8H as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HC7400SUK8H page in verification queue | Pall | partial | Fleetguard's online catalog lists HC7400SUK8H as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HC9540SUJ8H page in verification queue | Pall | partial | Fleetguard's online catalog lists HC9540SUJ8H as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HE3L page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists HE3L as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HF0660100 page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF0660100 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HF0660100JX page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF0660100JX as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HF779 page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF779 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ L224 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists L224 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ MFE901032 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists MFE901032 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ MPE4010 page in verification queue | MP Filtri | partial | Fleetguard's online catalog lists MPE4010 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ OD31794P2 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists OD31794P2 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
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↔ P3959 page in verification queue | Donaldson | partial | Fleetguard's online catalog lists P3959 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ P779666 page in verification queue | Donaldson | partial | Fleetguard's online catalog lists P779666 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ PF1126 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists PF1126 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ RSH475NM page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists RSH475NM as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SBF74008S7B page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SBF74008S7B as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SH56651 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SH56651 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SH56691 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SH56691 as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SP570H page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SP570H as an interchange for HF6601. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ WD10008 | MANN-FILTER | partial | MANN-FILTER's online catalog lists HF6601 (FLEETGUARD/CUMMINS FILTRATION) as a comparison number for WD10008. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ WD10008 | MANN-FILTER | partial | Fleetguard's online catalog lists WD10008 as an interchange for HF6601. 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 HF6601 model number is decoded
- HF6601Fleetguard HF-series hydraulic spin-on filter part number.
- 203.96 mmOverall height.
- 93.47 mmLargest outside diameter.
- 1.00 1/2-16 UN-2BSpin-on mounting thread.
- TWA 1 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).
- Fine 1 µm media loads faster and runs at a higher cold Δp than coarser grades — only downgrade cleanliness targets if the system ISO 4406 code allows it.
- 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 HF6601 filter element?
The published envelope is 93.47 mm OD × 203.96 mm length (3.680 × 8.030 in). Confirm against the housing drawing before ordering.
What micron rating does HF6601 use?
This element is rated 1 µm (nominal class) — TWA 1 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 HF6601 filter element?
49 partial match(es) requiring parameter review
How do I read the HF6601 part number?
See the designation decoder above: each segment of HF6601 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 9 catalog element(s) share the 93×204 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.