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BALDWIN · Engine Oil Filter

BT521

Full-Flow Lube Spin-on

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Call either store for your current price.
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Stock checked September 11, 12:46 PM Eastern. Call before travelling so we can confirm what is still available.

THE DETAILS THAT MATTER

FILTER SPECIFICATIONS.

Filter type
Full-Flow Lube Spin-on
Thread
7/8–16
Outside diameter
4 1/4 in.
Outside diameter (mm)
108.0
Length
7 11/32 in.
Length (mm)
186.5
Contains
Anti-Drainback Valve
Gasket
G381-A
Manufacturer part number
BT521
GTIN
00791440006072

CAUTION: Use ONLY on Case applications.;Contains NO by-pass valve.;Do NOT substitute for any other filter.

Baldwin replacement references: Case A62423

Baldwin PIES August 20, 2026 · Baldwin Product Guide July 24, 2026.

START WITH THE NUMBER YOU HAVE

CROSS-REFERENCE NUMBERS.

Baldwin’s reference lists the numbers below for BT521. Keep any size, quantity or application conditions with the match. A cross-reference alone does not confirm fit on your equipment.

33 manufacturer reference rows

Brand / manufacturerReference numberCondition / noteReference qty
AMERICAN PARTS20151
AMERICAN PARTS924581
BALDWIN FILTERSBT5210
CARQUEST963491
CASEA591101
CASEA624231
CO-OPPL591101
CYCLONEPM4611
DELUXE3681
DELUXEWD3681
DELUXEWD3931
DONALDSONP5513041
DONALDSONP5591301
DONALDSONP7791881
FLEETGUARDLF7901
FLEETRITELFR87901
GOULDP4611
GRAINGER4ENU61
HASTINGSBT5211
JURA (HIFI)SO7901
KOMATSUL790PP1
KRALINATORL1961
MOTORCRAFTFL2851
PERRYPL3681
PUROLATORL401221
PUROLATORPER1221
RYCOZ1441
SF-FILTER / SCHUPPSP44971
TECHNICAL FILTRATIONBSL7901
VOLVO80107731
VOLVOVOE80107731
WOODGATEWGL34651
WOODGATEWGL7901

Source: Baldwin Specs & Interchange · July 27, 2026. Reference quantity is part of the manufacturer’s cross-reference, not store stock.

CHECK THE EQUIPMENT. CHECK THE ENGINE.

APPLICATIONS & EQUIPMENT.

Case Tractors

Baldwin Product Guide summary. This description does not establish fit for every model from each manufacturer.

Call with your equipment model, engine and the number on the existing filter. Our counter will help verify the application.

A REAL COUNTER. CLOSE TO HOME.

YOUR LOCAL FILTER PEOPLE.

Bring the number off your old filter, or your equipment and engine details. We’ll help check the match.