PartsTable
Technical Data Sheet
PartsTable / COMPONENT / MIL-L-3851
MIL-L-3851 ✓ 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: 2.375 INCHES NOMINAL IN, overall_length: 1.188 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 5340-00-257-4954, 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
MIL-L-3851
NSN: 5340-00-257-4954
FSC: 5340
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
colorBLACK
insigniaNOT INCLUDED
materialSTEEL OVERALL
overall_width2.375 INCHES NOMINAL IN
overall_length1.188 INCHES NOMINAL IN
enameled_featureINCLUDED
specific_usage_designUSED FOR EQUIPAGE ITEM
buckle_style_designatorCENTER BAR
strap_accommodation_width2.125 INCHES NOMINAL IN
material_document_and_classificationQQ-S-698 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5340-00-257-4954
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MIL-L-3851 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
•
OUTSIDE WIDTH: 0.844 INCHES NOMINAL IN
•
MATERIAL: COPPER ALLOY
•
STYLE DESIGNATOR: DOUBLE OPENING
•
INSIDE LENGTH: 1.312 INCHES NOMINAL IN
•
PAINTED FEATURE: NOT INCLUDED
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL LENGTH1.625 INCHES NOMINAL IN
OUTSIDE WIDTH0.844 INCHES NOMINAL IN
MATERIALCOPPER ALLOY
STYLE DESIGNATORDOUBLE OPENING
INSIDE LENGTH1.312 INCHES NOMINAL IN
PAINTED FEATURENOT INCLUDED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
A-A-55620Upgraded Successor
successor cross-reference
successor
MIL-L-3851Upgraded Successor
successor cross-reference
successor
AA55620-7SUpgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
Ready to buy MIL-L-3851?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is MIL-L-3851?
MIL-L-3851 is a BUCKLE.
What parts can replace MIL-L-3851?
There are 3 known substitutes for MIL-L-3851: A-A-55620, MIL-L-3851, AA55620-7S. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-L-3851?
MIL-L-3851 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-257-4954. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Comments (0)
No comments yet. Be the first to share what you know.
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — MIL-L-3851

✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026