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BALDWIN · Engine Air Filter

BT40015

Air Breather Spin-on

Call for price
Call either store for your current price.
Belleville APCCall for availability
Kingston APCCall for availability

Stock checked September 11, 1:46 PM Eastern. Call before travelling so we can confirm what is still available.

Call Belleville ↗Call Kingston ↗Text your part number ↗

THE DETAILS THAT MATTER

FILTER SPECIFICATIONS.

Filter type
Air Breather Spin-on
Thread
3/8–18 NPT
Outside diameter
3 in.
Outside diameter (mm)
76.2
Length
2 25/32 in.
Length (mm)
70.6
Manufacturer part number
BT40015
GTIN
00791440100763

Baldwin replacement references: Caterpillar 9C4937

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 BT40015. Keep any size, quantity or application conditions with the match. A cross-reference alone does not confirm fit on your equipment.

10 manufacturer reference rows

Brand / manufacturerReference numberCondition / noteReference qty
BALDWIN FILTERSBT400151
CARQUEST946701
CATERPILLAR9C49371
DONALDSONP5026051
FLEETGUARDAB158031
FLEETGUARDAS25121
GRAINGER45KL531
JURA (HIFI)FS4051
SAKURAAC550301
SURE FILTER TECHNOLOGYSFA49371

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.

Caterpillar Excavators, Loaders, Off-Highway Trucks

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.