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4280666 ✓ Verified by PartsTable
— · ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include overall_height: 0.31 INCHES NOMINAL IN, overall_diameter: 1.26 INCHES NOMINAL IN, end_item_identification: MRAP - M-ATV, part_name_assigned_by_controlling_agency: CAP, MNL SWITCH, AFES, OPTICAL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-666-3310, 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
4280666
NSN: 5340-01-666-3310
FSC: 5340
CAGE: 75Q65 — OSHKOSH DEFENSE LLC (USA)
SPECIFICATIONS
overall_height0.31 INCHES NOMINAL IN
overall_diameter1.26 INCHES NOMINAL IN
end_item_identificationMRAP - M-ATV
part_name_assigned_by_controlling_agencyCAP, MNL SWITCH, AFES, OPTICAL
NSN5340-01-666-3310
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 4280666 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
•
OVERALL DIAMETER: 1.26 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL HEIGHT0.31 INCHES NOMINAL IN
END ITEM IDENTIFICATIONMRAP - M-ATV
PART NAME ASSIGNED BY CONTROLLING AGENCYCAP, MNL SWITCH, AFES, OPTICAL
OVERALL DIAMETER1.26 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
2484-36-2Interchangeable
interchangeable cross-reference
interchangeable
B-48-23Interchangeable
interchangeable cross-reference
interchangeable
1L-18527-36CInterchangeable
interchangeable cross-reference
interchangeable
59641Interchangeable
interchangeable cross-reference
interchangeable
24842Interchangeable
interchangeable cross-reference
interchangeable
2484/2Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4280666?
4280666 is a CAP,PROTECTIVE,DUST AND MOISTURE.
What parts can replace 4280666?
There are 12 known substitutes for 4280666: 2484-36-2, B-48-23, 1L-18527-36C and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4280666?
4280666 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-666-3310. 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