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1581A31 — HINGE,BUTT

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

1581A31: HINGE,BUTT.

The HINGE,BUTT is a the manufacturer industrial component. Key specifications include material: UNABLE TO DECODE, knuckle_type: FRICTION, pin_diameter: 0.187 INCHES NOMINAL IN, overall_length: 84.000 INCHES NOMINAL IN, performance_type: NOT RATED, material_thickness: 0.075 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-285-9005, 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
1581A31
NSN: 5340-01-285-9005
FSC: 5340 — Hardware, Commercial
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialUNABLE TO DECODE
knuckle_typeFRICTION
pin_diameter0.187 INCHES NOMINAL IN
overall_length84.000 INCHES NOMINAL IN
performance_typeNOT RATED
material_thickness0.075 INCHES NOMINAL IN
pin_center_to_body_edge_distance1.000 INCHES NOMINAL IN
NSN5340-01-285-9005
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 1581A31 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
•
PIN DIAMETER: 0.187 INCHES NOMINAL IN
•
PIN CENTER TO BODY EDGE DISTANCE: 1.000 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.075 INCHES NOMINAL IN
•
MATERIAL: UNABLE TO DECODE
•
KNUCKLE TYPE: FRICTION
•
PERFORMANCE TYPE: NOT RATED
TECHNICAL CHARACTERISTICS
PIN DIAMETER0.187 INCHES NOMINAL IN
OVERALL LENGTH84.000 INCHES NOMINAL IN
PIN CENTER TO BODY EDGE DISTANCE1.000 INCHES NOMINAL IN
MATERIAL THICKNESS0.075 INCHES NOMINAL IN
MATERIALUNABLE TO DECODE
KNUCKLE TYPEFRICTION
PERFORMANCE TYPENOT RATED
OTHER ITEMS IN FSC 5340 — Hardware, Commercial
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5340-00-000-0068 5340-00-000-0132 5340-00-000-8150 5340-00-001-1251 5340-00-001-1264 5340-00-001-1265 5340-00-001-1266 5340-00-001-1275
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 1581A31?
1581A31 is a HINGE,BUTT.
What is the NSN for 1581A31?
1581A31 is cataloged in the U.S. Government catalog under NSN 5340-01-285-9005. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.