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BALDWIN · Engine Air Filter

PA1647

Inner Air Element with 6 Bolts

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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
Inner Air Element with 6 Bolts
Outside diameter
4 3/4 in.
Outside diameter (mm)
120.7
Inside diameter
3 5/8 in.
Length
12 in.
Length (mm)
304.8
Manufacturer part number
PA1647
GTIN
00791440012790

Baldwin replacement references: Caterpillar 2S1285

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 PA1647. Keep any size, quantity or application conditions with the match. A cross-reference alone does not confirm fit on your equipment.

140 manufacturer reference rows

Brand / manufacturerReference numberCondition / noteReference qty
ACDELCOA290C1
ACDELCOPC3381
AIR REFINERARM7121
AMERICAN MOTORS CORP.CA17741
AMERICAN PARTS2951
AMERICAN PARTS930481
AP FILTERSAP30081
AP FILTERSAP3008A1
AP LOCKHEEDAP30081
AP LOCKHEEDAP3008A1
AP LOCKHEEDLK30081
BALDWIN FILTERSPA16471
BIG A FILTER2951
BIG A FILTER930481
BOSCH14574336641
BOWESLAF481
CANADIAN FILTER CO.CFM771
CARQUEST870481
CATERPILLAR1W0217Inner, Filter O1
CATERPILLAR2P3224Inner, Filter O1
CATERPILLAR2S12851
CATERPILLAR2S1289Inner, Filter O1
CATERPILLAR2S3087Inner, Filter O1
CATERPILLAR3I04251
CATERPILLAR3P0085Inner, Filter O1
CATERPILLAR4M80481
CATERPILLAR4M81481
CATERPILLAR5M0957Inner, Filter O1
CATERPILLAR5M957Inner, Filter O1
CATERPILLAR5S9004Inner, Filter O1
CATERPILLAR7S2513Inner, Filter O1
CATERPILLAR9M1884Inner, Filter O1
CHAMPION LABORATORIESAF481
CHAMPION LABORATORIESLAF481
CLARK EQUIPMENT6202151
CLEAN FILTERSMA5021
CO-OPAP4M80481
CO-OPPMA4M80481
CONTINENTALPCA2371
COOPERSAZA6041
CROSLAND95861
CYCLONEPMA4M80481
DELUXE5981
DELUXE598AIR1
DELUXEAF5981
DIAMONDDX2141
DONALDSONEGB110011Inner, Filter O1
DONALDSONEGB110012Inner, Filter O1
DONALDSONEGB110022Inner, Filter O1
DONALDSONEGB110023Inner, Filter O1
DONALDSONEGB110024Inner, Filter O1
DONALDSONEGB110025Inner, Filter O1
DONALDSONP1043841
DONALDSONP1509331
DONALDSONP1586611
DONALDSONP9015121
FIAAMFL161951
FIAAMFL61951
FIAAMFLI61951
FILTA22221
FILTER CONTROL LTD.FCL22101
FLEETGUARDAF3431
FLEETLIFEFA2S12851
FLEETRITEAFR83431
FLUXFILTERAC2371
FRAM FiltersCA2371
GFFAF3050921
GIESSEAHI10431
GIF FILTERGA8091
GLOBAL FILTERS616471
GM GENERAL MOTORS64244091
GONHERG1285M1
GONHERGA12851
GONHERGA1285M1
GOULDAP4M80481
GPCFC2741
GRAINGER2TCN61
GREYFRIARS1254A1
GUARDIAN FILTER CO.G2S12851
GUD FILTERSADG6441
GUD FILTERSADG6541
HASTINGSAF1051
HEAVY DUTY AIRA12851
HEAVY DUTY AIRHDA12851
HENGSTE584LS1
INDUCONTROLAR2371
JURA (HIFI)SA102931
KNECHTLXS191
KRALINATORLA771
KRALINATORLA77F1
L.B. FILTERA6541
LUBER-FINERLAF481
MAHLELXS191
MANN+HUMMELC13711
MEGAFIL FILTROSVRA5651
MOTORCRAFTFA5251
MOTORCRAFTFA7351
NAPA GOLD20481
NELSON2S12851
NELSON70415N1
NELSON-WINSLOW2S12851
NSN NATIONAL STOCK NUMBER29400085881791
NU-TECHSS0011
O&K ORENSTEIN & KOPPEL1010141
PBRAI32071
PERRYPA5981
PUROLATORA520521
PUROLATORAF20521
QIF AIRACA2371
QUAKER STATEQSA2371
REFILCOAF20481
REYTORIT7121
ROMANR8047S1
RYCOHDA51091
SAKURAA5507SInner1
SAKURAA55081
SAVARA920282111
SAVARA920282171
SAVARA9230361
SAVARA923036111
SAVARA923036171
SF-FILTER / SCHUPPSL89301
SOPARISFDA31171
STAY READYSRPA7121
STAY READYSRPAM7121
SURE FILTER TECHNOLOGYSFA8047SETand1
SURE FILTER TECHNOLOGYSFA8048S1
TECFILAP80481
TECFILAR80481
TECNOCARA5341
TRU-AIRTA73651
UFI FILTERS27984001
UNITED AIR CLEANERU4M80481
UNITED ENGINE LIFEU4M80481
VIRGIS FILTERCH131571
WESTERN TOOL CO.WA20391
WGBSA1101
WIX420481
WIXDT80481
WOODGATEWGA3431

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 Equipment

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.