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Technical Data Sheet

M85049/138-31C — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

M85049/138-31C: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include end_item_identification: SPECIAL, AIR VEHICLE, AIRCRAFT, part_name_assigned_by_controlling_agency: BACKSHELL. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-722-4374, 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
M85049/138-31C
NSN: 5340-01-722-4374
FSC: 5340 — Hardware, Commercial
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
end_item_identificationSPECIAL, AIR VEHICLE, AIRCRAFT
part_name_assigned_by_controlling_agencyBACKSHELL
NSN5340-01-722-4374
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: M85049/138-31C 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
PART NAME ASSIGNED BY CONTROLLING AGENCYBACKSHELL
END ITEM IDENTIFICATIONSPECIAL, AIR VEHICLE, AIRCRAFT
SUBSTITUTES & CROSS-REFERENCES 2
SAE-AS85049/138Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
M85049Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is M85049/138-31C?
M85049/138-31C is a CAP,PROTECTIVE,DUST AND MOISTURE.
What parts can replace M85049/138-31C?
There are 2 known substitutes for M85049/138-31C: SAE-AS85049/138, M85049. Substitute compatibility should be verified for your specific system.
What is the NSN for M85049/138-31C?
M85049/138-31C is cataloged in the U.S. Government catalog under NSN 5340-01-722-4374. This indicates validated use in U.S. government and defense supply chains.
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