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PartsTable / COMPONENT / M85731/1-12
M85731/1-12 ✓ 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

The M85731/1-12 is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-406-9707, 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
M85731/1-12
NSN: 5340-01-406-9707
FSC: 5340
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part NumberM85731/1-12
NSN5340-01-406-9707
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: M85731/1-12 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
•
STYLE DESIGNATOR: MORTISE
•
SPECIFICATION/STANDARD DATA: 81349-MIL-F-85731/1 GOVERNMENT SPECIFICATION
•
MATERIAL: UNABLE TO DECODE
•
HOLE QUANTITY: 2
•
MATERIAL THICKNESS: 0.062 INCHES NOMINAL IN
•
HEIGHT: 0.375 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL LENGTH1.150 INCHES NOMINAL IN
STYLE DESIGNATORMORTISE
SPECIFICATION/STANDARD DATA81349-MIL-F-85731/1 GOVERNMENT SPECIFICATION
MATERIALUNABLE TO DECODE
HOLE QUANTITY2
OVERALL WIDTH0.438 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN
MATERIAL THICKNESS0.062 INCHES NOMINAL IN
HEIGHT0.375 INCHES NOMINAL IN
MOUNTING FACILITYUNTHREADED HOLE(S)
MOUNTING HOLE DIAMETER0.193 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
10117337Upgraded Successor
successor cross-reference
successor
500017CPUpgraded Successor
successor cross-reference
successor
500017-4-2CPUpgraded Successor
successor cross-reference
successor
500018Upgraded Successor
successor cross-reference
successor
M85731/1-7Upgraded Successor
successor cross-reference
successor
10117352Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M85731/1-12?
M85731/1-12 is a M85731/1-12.
What parts can replace M85731/1-12?
There are 22 known substitutes for M85731/1-12: 10117337, 500017CP, 500017-4-2CP and 19 more. Substitute compatibility should be verified for your specific system.
What is the NSN for M85731/1-12?
M85731/1-12 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-406-9707. 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