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2256479 — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

2256479: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include special_features: MFR DWG 256-0267, end_item_identification: GENERATOR SET, SHIP SERVICE DIESEL NO. 1 & NO.

2; BASIC ENGINE, 272-2228 COVER GP-VALVE MECHANISM, part_name_assigned_by_controlling_agency: CAP. This part is cataloged in the U.S. Government catalog under NSN 5340-01-531-1006, 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
2256479
NSN: 5340-01-531-1006
FSC: 5340 — Hardware, Commercial
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
special_featuresMFR DWG 256-0267
end_item_identificationGENERATOR SET, SHIP SERVICE DIESEL NO. 1 & NO. 2; BASIC ENGINE, 272-2228 COVER GP-VALVE MECHANISM
part_name_assigned_by_controlling_agencyCAP
NSN5340-01-531-1006
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 2256479 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
TECHNICAL CHARACTERISTICS
SPECIAL FEATURESMFR DWG 256-0267
PART NAME ASSIGNED BY CONTROLLING AGENCYCAP
END ITEM IDENTIFICATIONGENERATOR SET, SHIP SERVICE DIESEL NO. 1 & NO. 2; BASIC ENGINE, 272-2228 COVER GP-VALVE MECHANISM
OTHER ITEMS IN FSC 5340 — Hardware, Commercial
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5340-00-000-0068 5340-00-000-0132 5340-00-000-8150 5340-00-001-1251 5340-00-001-1264 5340-00-001-1265 5340-00-001-1266 5340-00-001-1275
SUBSTITUTES & CROSS-REFERENCES 1
225-6497Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 2256479?
2256479 is a CAP,PROTECTIVE,DUST AND MOISTURE.
What parts can replace 2256479?
There is 1 known substitute for 2256479: 225-6497. Substitute compatibility should be verified for your specific system.
What is the NSN for 2256479?
2256479 is cataloged in the U.S. Government catalog under NSN 5340-01-531-1006. 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.