Fleetguard · HF Hydraulic · return line
HF6603 filter element: specifications & equivalents
The HF6603 is a Fleetguard return-line hydraulic filter element, sized 93.47 × 147.83 mm OD × length. Verify against the current manufacturer data sheet before ordering.
Envelope OD × L 93.47 × 147.83 mm
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 |
| Outside diameter OD | 93.47 mm |
| Length | 147.83 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. | HF6603 |
| 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 | 147.83 mm (5.820 in) |
All 93×148 mm interchange elements →
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
|
↔ 1663736C1 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 1663736C1 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 23042062 page in verification queue | UFI | partial | Fleetguard's online catalog lists 23042062 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 3I1499 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 3I1499 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 4632122015 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 4632122015 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 557401 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 557401 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 57401 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 57401 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 57512931 page in verification queue | UFI | partial | Fleetguard's online catalog lists 57512931 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 575129311 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 575129311 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 61330170 page in verification queue | UFI | partial | Fleetguard's online catalog lists 61330170 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 7040777 page in verification queue | UFI | partial | Fleetguard's online catalog lists 7040777 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 7401 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 7401 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 775795 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 775795 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 84401 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 84401 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 91401 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 91401 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 93155555 page in verification queue | UFI | partial | Fleetguard's online catalog lists 93155555 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 9327073 page in verification queue | UFI | partial | Fleetguard's online catalog lists 9327073 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 998542 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 998542 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ BT8316-MPG | Baldwin Filters | partial | Fleetguard's online catalog lists BT8316MPG as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ BT8316-MPG | Baldwin Filters | partial | Baldwin's Form 561 Number-Finder cross-reference lists HF6603 (FLEETGUARD) as replaced by Baldwin BT8316-MPG. Form/fit listing without published performance data — verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ E0201B1R03 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists E0201B1R03 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ EHF7829 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists EHF7829 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ F4F030GCB page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists F4F030GCB as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ FBU8986 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists FBU8986 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ FJ23B page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists FJ23B as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HC7400SUP4H page in verification queue | Pall | partial | Fleetguard's online catalog lists HC7400SUP4H as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HF0660300 page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF0660300 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HF961 page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF961 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ L233 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists L233 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ MFE9003BN2 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists MFE9003BN2 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ MPE30BTA3 page in verification queue | MP Filtri | partial | Fleetguard's online catalog lists MPE30BTA3 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ P167829 page in verification queue | Donaldson | partial | Fleetguard's online catalog lists P167829 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ P168690 page in verification queue | Donaldson | partial | Fleetguard's online catalog lists P168690 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SF740043UM page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SF740043UM as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SH87252 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SH87252 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ TF338 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists TF338 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ V0201B1R03 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists V0201B1R03 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ W10008 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists W10008 as an interchange for HF6603. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ ZHE03P page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists ZHE03P as an interchange for HF6603. 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 HF6603 model number is decoded
- HF6603Fleetguard HF-series hydraulic spin-on filter part number.
- 147.83 mmOverall height.
- 93.47 mmLargest outside diameter.
- 1.00 1/2-16 UN-2BSpin-on mounting thread.
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 HF6603 filter element?
The published envelope is 93.47 mm OD × 147.83 mm length (3.680 × 5.820 in). Confirm against the housing drawing before ordering.
What replaces the HF6603 filter element?
38 partial match(es) requiring parameter review
How do I read the HF6603 part number?
See the designation decoder above: each segment of HF6603 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 26 catalog element(s) share the 93×148 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.