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Technical Data Sheet
PartsTable / COMPONENT / M21143/2-1
M21143/2-1 ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The M21143/2-1 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-324-8900, 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
M21143/2-1
NSN: 5315-01-324-8900
FSC: 5315
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part NumberM21143/2-1
NSN5315-01-324-8900
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: M21143/2-1 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
PIN OVERALL DIAMETER: 0.0311 INCHES MINIMUM AND 0.0313 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
PIN OVERALL LENGTH: 0.083 INCHES MINIMUM AND 0.103 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
MATERIAL: STEEL COMP 303 OVERALL
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
FIRST END STYLE: SQUARE
•
SURFACE FINISH: 16.0 MICROINCHES OUTSIDE DIAMETER
TECHNICAL CHARACTERISTICS (FLIS)
PIN OVERALL DIAMETER0.0311 INCHES MINIMUM AND 0.0313 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
PIN OVERALL LENGTH0.083 INCHES MINIMUM AND 0.103 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
MATERIALSTEEL COMP 303 OVERALL
SURFACE TREATMENTPASSIVATE OVERALL
FIRST END STYLESQUARE
SURFACE FINISH16.0 MICROINCHES OUTSIDE DIAMETER
SECOND END RELATIONSHIP WITH FIRST ENDIDENTICAL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 28
31071Interchangeable
interchangeable cross-reference
interchangeable
M21143/2-27Interchangeable
interchangeable cross-reference
interchangeable
L2088498-11Interchangeable
interchangeable cross-reference
interchangeable
D11-500Interchangeable
interchangeable cross-reference
interchangeable
752-5801-3Interchangeable
interchangeable cross-reference
interchangeable
MIL-P-21143/2Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M21143/2-1?
M21143/2-1 is a M21143/2-1.
What parts can replace M21143/2-1?
There are 28 known substitutes for M21143/2-1: 31071, M21143/2-27, L2088498-11 and 25 more. Substitute compatibility should be verified for your specific system.
Is M21143/2-1 still available?
M21143/2-1 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