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PartsTable / COMPONENT / MIL-F-85731/1
MIL-F-85731/1 ✓ 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 MIL-F-85731/1 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 5340-00-326-5351, 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
MIL-F-85731/1
NSN: 5340-00-326-5351
FSC: 5340
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part NumberMIL-F-85731/1
NSN5340-00-326-5351
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MIL-F-85731/1 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
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
STYLE DESIGNATOR: KNURLED NO. 2
•
THREAD SERIES DESIGNATOR: UNF
•
MATERIAL: UNABLE TO DECODE
•
THREAD QUANTITY PER INCH: 28
•
THREAD CLASS: 3A A
•
MOUNTING METHOD: PIN(S)
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD SIZE0.250 INCHES IN
STYLE DESIGNATORKNURLED NO. 2
THREAD SERIES DESIGNATORUNF
MATERIALUNABLE TO DECODE
SPECIAL FEATURESINCLUDES SELF-POSITIONING FEATURE
THREAD QUANTITY PER INCH28
THREAD CLASS3A A
MOUNTING METHODPIN(S)
THREAD DIRECTIONRIGHT-HAND
THREAD LENGTH1.375 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
MIL-F-85731/1Upgraded Successor
successor cross-reference
successor
M85731/1-12Upgraded Successor
successor cross-reference
successor
10117337Interchangeable
Same NIIN cross-reference
interchangeable
500017CPInterchangeable
Same NIIN cross-reference
interchangeable
500017-4-2CPInterchangeable
Same NIIN cross-reference
interchangeable
ST9M454-4-2CPInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-F-85731/1?
MIL-F-85731/1 is a MIL-F-85731/1.
What parts can replace MIL-F-85731/1?
There are 9 known substitutes for MIL-F-85731/1: MIL-F-85731/1, M85731/1-12, 10117337 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-F-85731/1?
MIL-F-85731/1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-326-5351. 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