STAUFF · Replacement Elements · inline line

SF-6521 filter element: specifications & equivalents

Name: SF-6521 filter element — STAUFF specifications and cross references
Brand: STAUFF

The SF-6521 is a STAUFF inline-line hydraulic filter element, sized 93.2 × 204 mm OD × length. Verify against the current manufacturer data sheet before ordering.

Envelope OD × L 93.2 × 204 mm

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 0.85.

Micron rating, media type, collapse pressure and seal material are not printed in the STAUFF interchange listing and are pending extraction from STAUFF product data sheets. Verify against the current STAUFF catalog before ordering.

Specification table

Parameter	Value
Filter type	inline line
Outside diameter OD	93.2 mm
Length	204 mm
Integral bypass valve	none (housing/valve-dependent)
Source catalog	STAUFF: STAUFF Filter Interchange online database (filterinterchange.com)
Last verified	2026-09-27

Sources: STAUFF — STAUFF Filter Interchange online database (filterinterchange.com) — accessed 2026-09-27.

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

Dimensions & series range

Outside diameter	93.2 mm (3.669 in)
Overall length	204 mm (8.031 in)

All 93×204 mm interchange elements →

Cross references & equivalents

Equivalent model	Brand	Match level	Note
↔ 0001301 page in verification queue	UFI	partial	STAUFF Filter Interchange lists 00.013.01 (UFI) as replaced by SF-6521. Envelope dimensions are published; media grade and performance data are not — confirm before substituting in cleanliness-critical circuits.
↔ 36400801001 page in verification queue	Aftermarket	partial	STAUFF Filter Interchange lists 36400801001 (GEHL) as replaced by SF-6521. Envelope dimensions are published; media grade and performance data are not — confirm before substituting in cleanliness-critical circuits.
↔ 3778897 page in verification queue	UFI	partial	STAUFF Filter Interchange lists 3778897 (CLARK) as replaced by SF-6521. Envelope dimensions are published; media grade and performance data are not — confirm before substituting in cleanliness-critical circuits.
↔ 70146 page in verification queue	Aftermarket	partial	STAUFF Filter Interchange lists 70146 (CIMTEK) as replaced by SF-6521. 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 SF-6521 model number is decoded

SF-6521STAUFF replacement element part number per the STAUFF Filter Interchange database.

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 SF-6521 filter element?

The published envelope is 93.2 mm OD × 204 mm length (3.669 × 8.031 in). Confirm against the housing drawing before ordering.

What replaces the SF-6521 filter element?

4 partial match(es) requiring parameter review

How do I read the SF-6521 part number?

See the designation decoder above: each segment of SF6521 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 1 catalog element(s) share the 93×204 mm envelope. Envelope match alone does not guarantee interchangeability — compare micron/Beta, seals and collapse rating.

SF-6511 STAUFF

Other models in the Replacement Elements series

All 3832 →

AD-030-B-125-B 83×193 mm AD-030-B-40-B 83×193 mm AD-030-B-60-B 83×193 mm AD-030-B-80-B 83×193 mm AD-030-E-20-B 83×193 mm AD-033-B-40-B 89×226 mm AD-033-B-60-B 89×226 mm AD-033-B-80-B 89×226 mm FE-BL-200 85×61 mm FE-BL-500 190×105 mm

Reviewed & verified by the ElementRef engineering desk against STAUFF on 2026-09-27. Read our editorial & correction policy.