MANN-FILTER · HD / WD Hydraulic · inline line
WD10021 filter element: specifications & equivalents
The WD10021 is a MANN-FILTER inline-line hydraulic filter element, sized 94 × 200 mm OD × length. Verify against the current manufacturer data sheet before ordering.
Dimensions and comparison numbers are taken from the MANN-FILTER online catalog API. Beta rating, collapse pressure and seal material vary by execution — verify against the current MANN data sheet before ordering.
Specification table
| Parameter | Value |
|---|---|
| Filter type | inline line |
| Outside diameter OD | 94 mm |
| Length | 200 mm |
| Thread / connection | 1 1/2-16 UN-2B |
| End caps | spin-on baseplate with attached gasket |
| Integral bypass valve | none (housing/valve-dependent) |
| Manufacturer part no. | WD10021_MANN-FILTER |
| Source catalog | MANN+HUMMEL / MANN-FILTER: MANN-FILTER online product catalog GraphQL API (mann-filter.com, store pcat_mf_en_store_en) |
| Last verified | 2026-09-28 |
Sources: MANN+HUMMEL / MANN-FILTER — MANN-FILTER online product catalog GraphQL API (mann-filter.com, store pcat_mf_en_store_en) — accessed 2026-09-27.
MANN-FILTER® and all model designations are trademarks of their respective owners, used here for identification only — ElementRef is an independent reference site, not an authorized MANN-FILTER distributor.
Dimensions & series range
| Outside diameter | 94 mm (3.701 in) |
| Overall length | 200 mm (7.874 in) |
All 94×200 mm interchange elements →
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| ↔ 51120 | WIX Filters | partial | MANN-FILTER's online catalog lists 51120 (WIX) as a comparison number for WD10021. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 85120 page in verification queue | Aftermarket | partial | MANN-FILTER's online catalog lists 85120 (CARQUEST) as a comparison number for WD10021. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ HF6635 | Fleetguard | partial | MANN-FILTER's online catalog lists HF6635 (FLEETGUARD/CUMMINS FILTRATION) as a comparison number for WD10021. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ HF6635 | Fleetguard | partial | Fleetguard's online catalog lists WD10021 as an interchange for HF6635. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ LFH4968 page in verification queue | Aftermarket | partial | MANN-FILTER's online catalog lists LFH4968 (LUBER-FINER) as a comparison number for WD10021. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ P550705 page in verification queue | Donaldson | partial | MANN-FILTER's online catalog lists P550705 (DONALDSON) as a comparison number for WD10021. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ P7306 page in verification queue | Donaldson | partial | MANN-FILTER's online catalog lists P7306 (FRAM) as a comparison number for WD10021. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SPH9297 page in verification queue | Aftermarket | partial | MANN-FILTER's online catalog lists SPH 9297 (SCHUPP / SF FILTER) as a comparison number for WD10021. 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 WD10021 model number is decoded
- WD10021MANN-FILTER hydraulic spin-on filter part number.
- 200 mmElement height (H).
- 94 mmOuter diameter (A).
- 1 1/2-16 UN-2BSpin-on mounting thread.
Typical equipment & applications
- Replacement element for OEM hydraulic filter housings
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 WD10021 filter element?
What replaces the WD10021 filter element?
How do I read the WD10021 part number?
Is a same-envelope aftermarket element always a drop-in replacement?
How often should a hydraulic return-line element be replaced?
Same-envelope elements from other brands
View full interchange →These 4 catalog element(s) share the 94×200 mm envelope. Envelope match alone does not guarantee interchangeability — compare micron/Beta, seals and collapse rating.
Other models in the HD / WD Hydraulic series
All 880 →Reviewed & verified by the ElementRef engineering desk against MANN+HUMMEL / MANN-FILTER on 2026-09-28. Read our editorial & correction policy.