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21529421-1 — GASKET

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

21529421-1: GASKET.

The GASKET is a the manufacturer industrial component. Key specifications include material: FIBER OVERALL, special_features: AFTERCOOLER; INLET AND OUTLET; 6.0 INS SQUARE, aperture_diameter: 4.562 INCHES NOMINAL IN, end_item_identification: ENGINE,DIESEL P/N 251F18MS, cross-sectional_thickness: 0.625 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5330-01-641-5097, 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
21529421-1
NSN: 5330-01-641-5097
FSC: 5330 — Packing and Gasket Materials
CAGE: 50024 — COLTEC INDUSTRIES INC DBA FAIRBANKS MORSE ENGINE FM/ALCO (USA)
SPECIFICATIONS
materialFIBER OVERALL
special_featuresAFTERCOOLER; INLET AND OUTLET; 6.0 INS SQUARE
aperture_diameter4.562 INCHES NOMINAL IN
end_item_identificationENGINE,DIESEL P/N 251F18MS
cross-sectional_thickness0.625 INCHES NOMINAL IN
NSN5330-01-641-5097
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 21529421-1 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
CROSS-SECTIONAL THICKNESS: 0.625 INCHES NOMINAL IN
•
APERTURE DIAMETER: 4.562 INCHES NOMINAL IN
•
MATERIAL: FIBER OVERALL
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL THICKNESS0.625 INCHES NOMINAL IN
APERTURE DIAMETER4.562 INCHES NOMINAL IN
SPECIAL FEATURESAFTERCOOLER; INLET AND OUTLET; 6.0 INS SQUARE
END ITEM IDENTIFICATIONENGINE,DIESEL P/N 251F18MS
MATERIALFIBER OVERALL
OTHER ITEMS IN FSC 5330 — Packing and Gasket Materials
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5330-00-000-0085 5330-00-000-0167 5330-00-000-5275 5330-00-001-1260 5330-00-001-1833 5330-00-001-1844 5330-00-001-1845 5330-00-001-1846
SUBSTITUTES & CROSS-REFERENCES 1
21529421Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 21529421-1?
21529421-1 is a GASKET.
What parts can replace 21529421-1?
There is 1 known substitute for 21529421-1: 21529421. Substitute compatibility should be verified for your specific system.
What is the NSN for 21529421-1?
21529421-1 is cataloged in the U.S. Government catalog under NSN 5330-01-641-5097. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.