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PartsTable / COMPONENT / M85731/1-9
M85731/1-9 ✓ 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 M85731/1-9 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-440-4536, 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
M85731/1-9
NSN: 5340-01-440-4536
FSC: 5340
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part NumberM85731/1-9
NSN5340-01-440-4536
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: M85731/1-9 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
•
THREAD QUANTITY PER INCH: 24
•
THREAD SERIES DESIGNATOR: UNF
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.312 INCHES IN
•
MATERIAL: UNABLE TO DECODE
•
MOUNTING METHOD: PIN(S)
•
THREAD LENGTH: 1.375 INCHES NOMINAL IN
•
STYLE DESIGNATOR: KNURLED NO. 2
TECHNICAL CHARACTERISTICS (FLIS)
THREAD QUANTITY PER INCH24
THREAD SERIES DESIGNATORUNF
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.312 INCHES IN
MATERIALUNABLE TO DECODE
MOUNTING METHODPIN(S)
THREAD LENGTH1.375 INCHES NOMINAL IN
STYLE DESIGNATORKNURLED NO. 2
THREAD CLASS3A A
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
6530NCM139217Upgraded Successor
successor cross-reference
successor
50-0020Upgraded Successor
successor cross-reference
successor
703376Upgraded Successor
successor cross-reference
successor
914534Interchangeable
interchangeable cross-reference
interchangeable
11943AInterchangeable
interchangeable cross-reference
interchangeable
1431Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M85731/1-9?
M85731/1-9 is a M85731/1-9.
What parts can replace M85731/1-9?
There are 17 known substitutes for M85731/1-9: 6530NCM139217, 50-0020, 703376 and 14 more. Substitute compatibility should be verified for your specific system.
Is M85731/1-9 still available?
M85731/1-9 is currently cancelled.
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PartsTable Design LLC · partstable.com
Last verified: July 2026