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PartsTable / COMPONENT / 57MD21A
57MD21A ✓ Verified by PartsTable
— · COMPONENT
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

FILTER ELEMENT,INTAKE AIR CLEANE. Key specifications include material: METAL BODY, design_type: NONREUSABLE, body_diameter: 12.750 INCHES NOMINAL IN, special_features: GASKETS ATTACHED BOTH ENDS, style_designator: CYLINDRICAL W/ CONTAINER (RIGID), body_overall_length: 9.000 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 2940-01-174-5978, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
57MD21A
NSN: 2940-01-174-5978
FSC: 2940
CAGE: 89619 — MACK TRUCKS, INC. DBA MACUNGIE OPERATIONS DIV LEHIGH VALLEY OPERATIONS (USA)
SPECIFICATIONS
materialMETAL BODY
design_typeNONREUSABLE
body_diameter12.750 INCHES NOMINAL IN
special_featuresGASKETS ATTACHED BOTH ENDS
style_designatorCYLINDRICAL W/ CONTAINER (RIGID)
body_overall_length9.000 INCHES NOMINAL IN
body_inside_diameter8.375 INCHES NOMINAL IN
filtering_media_designPERFORATED SINGLE FILTERING MEDIA RESPONSE
end_item_identificationTRUCK, MACK TRUCK INC., MODEL 1975
NSN2940-01-174-5978
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available FILTER ELEMENT,INTAKE AIR CLEANE TITLE COMPONENT PN 57MD21A MFR FILTER ELEMENT,INTAKE
KEY FEATURES
•
DESIGN TYPE: NONREUSABLE
•
BODY DIAMETER: 12.750 INCHES NOMINAL IN
•
BODY INSIDE DIAMETER: 8.375 INCHES NOMINAL IN
•
BODY OVERALL LENGTH: 9.000 INCHES NOMINAL IN
•
STYLE DESIGNATOR: CYLINDRICAL W/ CONTAINER (RIGID)
•
FILTERING MEDIA DESIGN: PERFORATED SINGLE FILTERING MEDIA RESPONSE
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESGASKETS ATTACHED BOTH ENDS
DESIGN TYPENONREUSABLE
BODY DIAMETER12.750 INCHES NOMINAL IN
BODY INSIDE DIAMETER8.375 INCHES NOMINAL IN
END ITEM IDENTIFICATIONTRUCK, MACK TRUCK INC., MODEL 1975
BODY OVERALL LENGTH9.000 INCHES NOMINAL IN
STYLE DESIGNATORCYLINDRICAL W/ CONTAINER (RIGID)
FILTERING MEDIA DESIGNPERFORATED SINGLE FILTERING MEDIA RESPONSE
MATERIALMETAL BODY
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
3-314Interchangeable
interchangeable cross-reference
interchangeable
5263-5Interchangeable
interchangeable cross-reference
interchangeable
2635Interchangeable
interchangeable cross-reference
interchangeable
GGG-W-636 TY9CL2Interchangeable
interchangeable cross-reference
interchangeable
GGG-W-636Interchangeable
interchangeable cross-reference
interchangeable
1271-4250Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 57MD21A?
57MD21A is a FILTER ELEMENT,INTAKE AIR CLEANE.
What parts can replace 57MD21A?
There are 21 known substitutes for 57MD21A: 3-314, 5263-5, 2635 and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 57MD21A?
57MD21A is cataloged in the Federal Logistics Information System (FLIS) under NSN 2940-01-174-5978. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026