WIX Filters · 51xxx · return line

51622 filter element: specifications & equivalents

The 51622 is a WIX Filters return-line hydraulic filter element, built with enhanced cellulose media, sized 93.8 × 132.5 mm OD × length, rated at 28 µm class (not separately rated (nominal enhanced cellulose)). Verify against the current manufacturer data sheet before ordering.

Envelope OD × L 93.8 × 132.5 mm

Filtration rating 28 µm nom.

Beta rating not separately rated (nominal enhanced cellulose)

Media Enhanced Cellulose

Thread 3/4-16

Collapse / burst 34.473 bar

Line type return

Catalog verified. Parameters extracted from the manufacturer’s electronic catalog / official interchange document and checked 2026-09-27. Confidence score 0.90.

Specification table

Parameter	Value
Filter type	return line
Media	Enhanced Cellulose
Filtration rating	28 µm
Rating basis	nominal
Beta ratio	not separately rated (nominal enhanced cellulose)
Outside diameter OD	93.8 mm
Length	132.5 mm
Thread / connection	3/4-16
End caps	spin-on baseplate with attached gasket
Flow direction	outside-in
Collapse / burst pressure	34.473 bar
Integral bypass valve	opens at 0.482 bar
Seal material	Nitrile (NBR)
Manufacturer part no.	51622
Source catalog	WIX Filters (MANN+HUMMEL): WIX Filters online product catalog
Last verified	2026-09-27

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.

Dimensions & series range

Outside diameter	93.8 mm (3.693 in)
Overall length	132.5 mm (5.217 in)

All 94×133 mm interchange elements →

Cross references & equivalents

No catalog-verified cross references yet. This model is in the manual verification queue — request a verified equivalent.

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 51622 model number is decoded

51622WIX hydraulic spin-on filter part number.
3/4-16Mounting thread: 3/4-16 (spin-on baseplate).
Enhanced CelluloseFilter media: Enhanced Cellulose.

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

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 execution carries an integral bypass valve (opens at 0.482 bar). The same envelope also exists without it, relying on the housing valve. Mixing the two strategies changes cold-start protection — match what was installed originally.
“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 51622 filter element?

The published envelope is 93.8 mm OD × 132.5 mm length (3.693 × 5.217 in). Confirm against the housing drawing before ordering.

What micron rating does 51622 use?

This element is rated 28 µm (nominal class) — not separately rated (nominal enhanced cellulose). Always compare Beta ratings at the same test point: two brands may print different micron numbers for the same physical grade.

What replaces the 51622 filter element?

Cross references are being verified for this model — use the inquiry form and the engineering desk will confirm equivalents.

How do I read the 51622 part number?

See the designation decoder above: each segment of 51622 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 4 catalog element(s) share the 94×133 mm envelope. Envelope match alone does not guarantee interchangeability — compare micron/Beta, seals and collapse rating.

51545 WIX Filters · 21 µm 51610 WIX Filters · 10 µm 51611 WIX Filters · 32 µm 57110 WIX Filters · 10 µm

Other models in the 51xxx series

All 306 →

51089 74×144 mm · 32 µm 51096 115×183 mm · 5 µm 51097 114×231 mm · 10 µm 51098 115×227 mm · 23 µm 51113 129×228 mm · 5 µm 51116 94×198 mm · 11 µm 51119 115×229 mm · 23 µm 51120 94×198 mm · 9 µm 51127 88×235 mm · 32 µm 51134 152×216 mm · 10 µm

Reviewed & verified by the ElementRef engineering desk against WIX Filters (MANN+HUMMEL) on 2026-09-27. Read our editorial & correction policy.