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PartsTable / COMPONENT / M85731/1-18
M85731/1-18 ✓ 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 M85731/1-18 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-345-6419, 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
M85731/1-18
NSN: 5340-01-345-6419
FSC: 5340
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part NumberM85731/1-18
NSN5340-01-345-6419
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: M85731/1-18 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
•
MOUNTING HOLE DIAMETER: 0.195 INCHES NOMINAL IN
•
STYLE DESIGNATOR: BUTT PARALLEL HOLES
•
MATERIAL: STEEL OVERALL
•
KNUCKLE TYPE: FRICTION
•
MOUNTING HOLE QUANTITY: 2
•
KNUCKLE LENGTH: 0.125 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
MOUNTING HOLE DIAMETER0.195 INCHES NOMINAL IN
STYLE DESIGNATORBUTT PARALLEL HOLES
MATERIALSTEEL OVERALL
KNUCKLE TYPEFRICTION
SPECIAL FEATURESMATES WITH -8,-9,-10 LATCH ASSEMBLY
MOUNTING HOLE QUANTITY2
KNUCKLE LENGTH0.125 INCHES NOMINAL IN
OVERALL LENGTH1.500 INCHES NOMINAL IN
PIN CENTER TO BODY EDGE DISTANCE0.344 INCHES NOMINAL IN
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
902005Upgraded Successor
successor cross-reference
successor
MIL-F-85731Upgraded Successor
successor cross-reference
successor
MS14108-15Upgraded Successor
successor cross-reference
successor
M85731/1-15Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-85731/1Interchangeable
interchangeable cross-reference
interchangeable
MS14108-13Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M85731/1-18?
M85731/1-18 is a M85731/1-18.
What parts can replace M85731/1-18?
There are 17 known substitutes for M85731/1-18: 902005, MIL-F-85731, MS14108-15 and 14 more. Substitute compatibility should be verified for your specific system.
Is M85731/1-18 still available?
M85731/1-18 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026