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Technical Data Sheet
PartsTable / COMPONENT / MS51940-9S
MS51940-9S ✓ 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 BUCKLE is a the manufacturer industrial component. Key specifications include color: BLACK, insignia: NOT INCLUDED, material: STEEL OVERALL, overall_width: 1.266 INCHES NOMINAL IN, overall_length: 0.750 INCHES NOMINAL IN, enameled_feature: INCLUDED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-664-6395, 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
MS51940-9S
NSN: 5340-00-664-6395
FSC: 5340
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
colorBLACK
insigniaNOT INCLUDED
materialSTEEL OVERALL
overall_width1.266 INCHES NOMINAL IN
overall_length0.750 INCHES NOMINAL IN
enameled_featureINCLUDED
strap_accommodation_width1.000 INCHES NOMINAL IN
NSN5340-00-664-6395
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MS51940-9S 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
•
MATERIAL: STEEL OVERALL
•
COLOR: BLACK
•
INSIGNIA: NOT INCLUDED
•
STRAP ACCOMMODATION WIDTH: 1.000 INCHES NOMINAL IN
•
ENAMELED FEATURE: INCLUDED
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL WIDTH1.266 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
COLORBLACK
INSIGNIANOT INCLUDED
STRAP ACCOMMODATION WIDTH1.000 INCHES NOMINAL IN
ENAMELED FEATUREINCLUDED
OVERALL LENGTH0.750 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
834114Upgraded Successor
successor cross-reference
successor
02300-1Upgraded Successor
successor cross-reference
successor
BEAC0NInterchangeable
interchangeable cross-reference
interchangeable
EN110AInterchangeable
interchangeable cross-reference
interchangeable
0230001Interchangeable
interchangeable cross-reference
interchangeable
MS51940-3SInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51940-9S?
MS51940-9S is a BUCKLE.
What parts can replace MS51940-9S?
There are 20 known substitutes for MS51940-9S: 834114, 02300-1, BEAC0N and 17 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS51940-9S?
MS51940-9S is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-664-6395. 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