Parker · ParFit Interchange · inline line

939305Q filter element: specifications & equivalents

The 939305Q is a Parker inline-line hydraulic filter element. Verify against the current manufacturer data sheet before ordering.

Line type inline

Partially verified. Fit and grade trace to an official interchange document; dimensional values are compiled from 0 aftermarket listing(s) and must be confirmed against the manufacturer housing drawing. Confidence score 0.80.

ParFit catalogs list the interchange only — Parker prints no dimensions, micron rating, collapse pressure or seal data in the interchange table. Verify every specification against the current Parker data sheet before ordering.

Specification table

Parameter	Value
Filter type	inline line
Integral bypass valve	none (housing/valve-dependent)
Manufacturer part no.	939305Q
Source catalog	Parker Hannifin (Hydraulic Filter Division): Parker ParFit™ Competitive Interchange
Last verified	2026-09-30

Sources: Parker Hannifin (Hydraulic Filter Division) — Parker ParFit™ Competitive Interchange — accessed 2026-09-30.

Parker® and all model designations are trademarks of their respective owners, used here for identification only — ElementRef is an independent reference site, not an authorized Parker distributor.

Cross references & equivalents

Equivalent model	Brand	Match level	Note
↔ 134000925040FILTERCANDLE25UM page in verification queue	Aftermarket	partial	Parker ParFit interchange — Boll+Kirch 1340009 (250-40 filter candle 25 um) replaced by Parker 939305Q. Envelope match; verify grade and seals.
↔ SFK-440-025-G-O-O-SS	STAUFF	partial	STAUFF Filter Interchange lists 939305Q (PARKER) as replaced by SFK-440-025-G-O-O-SS. Envelope dimensions are published; media grade and performance data are not — confirm before substituting in cleanliness-critical circuits.

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 939305Q model number is decoded

939305QParker ParFit replacement element part number per the Parker Hydraulic Filter Division interchange catalog.

Typical equipment & applications

Hydraulic/lubrication filter element per Parker ParFit™ competitive interchange.

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 replaces the 939305Q filter element?

2 partial match(es) requiring parameter review

How do I read the 939305Q part number?

See the designation decoder above: each segment of 939305Q 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.

Other models in the ParFit Interchange series

All 935 →

1/4 901106 901473 901493 901494 901535 901536 901619 901620 901826

Reviewed & verified by the ElementRef engineering desk against Parker Hannifin (Hydraulic Filter Division) on 2026-09-30. Read our editorial & correction policy.