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PartsTable / COMPONENT / M21143/2-128
M21143/2-128 ✓ 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 M21143/2-128 is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-343-8477, 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
M21143/2-128
NSN: 5315-01-343-8477
FSC: 5315
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part NumberM21143/2-128
NSN5315-01-343-8477
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: M21143/2-128 · 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
•
FIRST END STYLE: SQUARE
•
SECOND END RELATIONSHIP WITH FIRST END: IDENTICAL
•
MATERIAL: STEEL COMP 303 OVERALL
•
PIN OVERALL LENGTH: 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
•
PIN OVERALL DIAMETER: 0.2186 INCHES MINIMUM AND 0.2188 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
FIRST END STYLESQUARE
SECOND END RELATIONSHIP WITH FIRST ENDIDENTICAL
MATERIALSTEEL COMP 303 OVERALL
PIN OVERALL LENGTH0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
PIN OVERALL DIAMETER0.2186 INCHES MINIMUM AND 0.2188 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 24
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
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M21143/2-128?
M21143/2-128 is a M21143/2-128.
What parts can replace M21143/2-128?
There are 24 known substitutes for M21143/2-128: 31071, M21143/2-27, L2088498-11 and 21 more. Substitute compatibility should be verified for your specific system.
What is the NSN for M21143/2-128?
M21143/2-128 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-343-8477. 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