WIX Filters · 51xxx · return line
51566 filter element: specifications & equivalents
The 51566 is a WIX Filters return-line hydraulic filter element, built with wire/glass media, sized 127 × 297.4 mm OD × length, rated at 15 µm class (β75 = 25). Verify against the current manufacturer data sheet before ordering.
Specification table
| Parameter | Value |
|---|---|
| Filter type | return line |
| Media | Wire/Glass |
| Filtration rating | 15 µm |
| Rating basis | nominal |
| Beta ratio | β75 = 25 |
| Outside diameter OD | 127 mm |
| Length | 297.4 mm |
| Thread / connection | 1 1/2-16 |
| End caps | spin-on baseplate with attached gasket |
| Flow direction | outside-in |
| Collapse / burst pressure | 55.2 bar |
| Integral bypass valve | none (housing/valve-dependent) |
| Seal material | Nitrile (NBR) |
| Manufacturer part no. | 51566 |
| Source catalog | WIX Filters (MANN+HUMMEL): WIX Filters online product catalog |
| Last verified | 2026-09-28 |
Sources: WIX Filters (MANN+HUMMEL) — WIX Filters online product catalog — accessed 2026-09-26.
WIX Filters® and all model designations are trademarks of their respective owners, used here for identification only — ElementRef is an independent reference site, not an authorized WIX Filters distributor.
Dimensional drawing
Dimensions & series range
| Outside diameter | 127 mm (5.000 in) |
| Overall length | 297.4 mm (11.709 in) |
All 127×297 mm interchange elements →
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| ↔ HF6824 | Fleetguard | partial | Fleetguard's online catalog lists 51566 as an interchange for HF6824. 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.
Full chart: WIX Filters cross reference chart →
How the 51566 model number is decoded
- 51566WIX hydraulic spin-on filter part number.
- 1 1/2-16Mounting thread: 1 1/2-16 (spin-on baseplate).
- Wire/GlassFilter media: Wire/Glass.
Typical equipment & applications
- Mobile and industrial hydraulic return circuits
- Construction and agricultural equipment
- Heavy-duty transmission and torque-converter circuits
Selection pitfalls — read before you substitute
- Line type is not interchangeable: return-line cartridges are low-collapse executions that typically tolerate roughly 10–20 bar differential, while pressure-line elements are commonly rated 100–210 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.
- This execution uses nitrile (nbr) seals — verify the compound against the fluid data sheet: standard nitrile (NBR) can fail early in phosphate-ester fluids and at sustained high temperature, where 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 51566 filter element?
What micron rating does 51566 use?
What replaces the 51566 filter element?
How do I read the 51566 part number?
Is a same-envelope aftermarket element always a drop-in replacement?
How often should a hydraulic filter element be replaced?
Same-envelope elements from other brands
View full interchange →These 1 catalog element(s) share the 127×297 mm envelope. Envelope match alone does not guarantee interchangeability — compare micron/Beta, seals and collapse rating.
Other models in the 51xxx series
All 306 →Reviewed & verified by the ElementRef engineering desk against WIX Filters (MANN+HUMMEL) on 2026-09-28. Read our editorial & correction policy.