PartsTable
Technical Data Sheet
M85731-15 ✓ 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 LEAF,BUTT HINGE is a the manufacturer industrial component. Key specifications include material: UNABLE TO DECODE, thread_class: 3A A, thread_length: 1.000 INCHES NOMINAL IN, mounting_method: PIN(S), style_designator: KNURLED NO. 2, thread_direction: RIGHT-HAND.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-340-4131, 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
M85731-15
NSN: 5340-00-340-4131
FSC: 5340
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialUNABLE TO DECODE
thread_class3A A
thread_length1.000 INCHES NOMINAL IN
mounting_methodPIN(S)
style_designatorKNURLED NO. 2
thread_directionRIGHT-HAND
nominal_thread_size0.250 INCHES IN
thread_quantity_per_inch28
thread_series_designatorUNF
NSN5340-00-340-4131
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: M85731-15 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
REVERSIBLE FEATURE: NOT INCLUDED
MOUNTING HOLE DIAMETER: 0.193 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN
KNUCKLE LENGTH: 0.125 INCHES NOMINAL IN
STYLE DESIGNATOR: BUTT PARALLEL HOLES
KNUCKLE TYPE: FRICTION
HINGE PIN: NOT INCLUDED
MATERIAL DOCUMENT AND CLASSIFICATION: AISI 4140 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
SURFACE TREATMENT: CADMIUM AND CHROMATE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
REVERSIBLE FEATURENOT INCLUDED
MOUNTING HOLE DIAMETER0.193 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN
KNUCKLE LENGTH0.125 INCHES NOMINAL IN
STYLE DESIGNATORBUTT PARALLEL HOLES
KNUCKLE TYPEFRICTION
HINGE PINNOT INCLUDED
MATERIAL DOCUMENT AND CLASSIFICATIONAISI 4140 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
PERFORMANCE TYPENOT RATED
MOUNTING HOLE QUANTITY2
VERIFIED SUBSTITUTES & CROSS-REFERENCES 24
MIL-F-85731Upgraded Successor
successor cross-reference
successor
M85731/1-18Upgraded Successor
successor cross-reference
successor
MS14108-18Upgraded Successor
successor cross-reference
successor
M85731/1-15Upgraded Successor
successor cross-reference
successor
MIL-DTL-85731/1Upgraded Successor
successor cross-reference
successor
MS14108-13Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M85731-15?
M85731-15 is a LEAF,BUTT HINGE.
What parts can replace M85731-15?
There are 24 known substitutes for M85731-15: MIL-F-85731, M85731/1-18, MS14108-18 and 21 more. Substitute compatibility should be verified for your specific system.
Is M85731-15 still available?
M85731-15 is currently cancelled.
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