PartsTable
Technical Data Sheet
MIL-B-543 ✓ 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: INCLUDED, material: STEEL BODY, overall_width: 1.500 INCHES NOMINAL IN, overall_length: 1.500 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 5340-00-157-7987, 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-B-543
NSN: 5340-00-157-7987
FSC: 5340
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
colorBLACK
insigniaINCLUDED
materialSTEEL BODY
overall_width1.500 INCHES NOMINAL IN
overall_length1.500 INCHES NOMINAL IN
enameled_featureINCLUDED
specific_usage_designFOR USE ON ITEMS OF EQUIPMENT HAVING STRAP-BUCKLE-TYPE FASTENERS
buckle_style_designatorEND BAR WITH TONGUE
strap_accommodation_width1.000 INCHES NOMINAL IN
NSN5340-00-157-7987
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MIL-B-543 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
ENAMELED FEATURE: INCLUDED
SPECIFICATION/STANDARD DATA: 81349-MIL-543 GOVERNMENT SPECIFICATION
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-698 TEMP 4 OR 5 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
COLOR: BLACK
INSIGNIA: NOT INCLUDED
MATERIAL: STEEL OVERALL
NONDEFINITIVE SPEC/STD DATA: 2 TYPE AND 3 STYLE AND 3 CLASS AND 0.625 SIZE
BUCKLE STYLE DESIGNATOR: DOUBLE BAR-TONGUELESS
TECHNICAL CHARACTERISTICS (FLIS)
ENAMELED FEATUREINCLUDED
SPECIFICATION/STANDARD DATA81349-MIL-543 GOVERNMENT SPECIFICATION
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-698 TEMP 4 OR 5 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
COLORBLACK
INSIGNIANOT INCLUDED
MATERIALSTEEL OVERALL
NONDEFINITIVE SPEC/STD DATA2 TYPE AND 3 STYLE AND 3 CLASS AND 0.625 SIZE
BUCKLE STYLE DESIGNATORDOUBLE BAR-TONGUELESS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
MIL-B-543Interchangeable
interchangeable cross-reference
interchangeable
MS51944-3Interchangeable
interchangeable cross-reference
interchangeable
MS51944-9Interchangeable
interchangeable cross-reference
interchangeable
MS51944-10Interchangeable
interchangeable cross-reference
interchangeable
MS51944-5Interchangeable
interchangeable cross-reference
interchangeable
MS51927-5Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
Ready to buy MIL-B-543?
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-B-543?
MIL-B-543 is a BUCKLE.
What parts can replace MIL-B-543?
There are 15 known substitutes for MIL-B-543: MIL-B-543, MS51944-3, MS51944-9 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-B-543?
MIL-B-543 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-157-7987. 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-B-543