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PartsTable / COMPONENT / MS51940-4
MS51940-4 ✓ 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: 1.880 INCHES NOMINAL IN, overall_length: 1.190 INCHES NOMINAL IN, enameled_feature: INCLUDED. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-878-8827, 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
MS51940-4
NSN: 5340-00-878-8827
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_width1.880 INCHES NOMINAL IN
overall_length1.190 INCHES NOMINAL IN
enameled_featureINCLUDED
special_featuresOPTIONAL BUCKLE STYLE RDGB30
buckle_style_designatorCENTER BAR
strap_accommodation_width1.630 INCHES NOMINAL IN
NSN5340-00-878-8827
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MS51940-4 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
•
INSIGNIA: NOT INCLUDED
•
BUCKLE STYLE DESIGNATOR: CENTER BAR
•
COLOR: BLACK
•
STRAP ACCOMMODATION WIDTH: 1.630 INCHES NOMINAL IN
•
ENAMELED FEATURE: INCLUDED
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL WIDTH1.880 INCHES NOMINAL IN
OVERALL LENGTH1.190 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
INSIGNIANOT INCLUDED
BUCKLE STYLE DESIGNATORCENTER BAR
COLORBLACK
STRAP ACCOMMODATION WIDTH1.630 INCHES NOMINAL IN
ENAMELED FEATUREINCLUDED
SPECIAL FEATURESOPTIONAL BUCKLE STYLE RDGB30
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
02300-1Interchangeable
interchangeable cross-reference
interchangeable
A-A-55620Interchangeable
interchangeable cross-reference
interchangeable
826720Interchangeable
interchangeable cross-reference
interchangeable
MS51940-3SInterchangeable
interchangeable cross-reference
interchangeable
AA55620-3SInterchangeable
interchangeable cross-reference
interchangeable
5340-821-5871Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51940-4?
MS51940-4 is a BUCKLE.
What parts can replace MS51940-4?
There are 13 known substitutes for MS51940-4: 02300-1, A-A-55620, 826720 and 10 more. Substitute compatibility should be verified for your specific system.
Is MS51940-4 still available?
MS51940-4 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