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M21143/2-128 — Technical Data Sheet

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— · 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 PIN,STRAIGHT,HEADLESS is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OVERALL, first_end_style: SQUARE, 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, second_end_relationship_with_first_end: IDENTICAL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System 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
materialSTEEL COMP 303 OVERALL
first_end_styleSQUARE
pin_overall_length0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
pin_overall_diameter0.2186 INCHES MINIMUM AND 0.2188 INCHES MAXIMUM IN
second_end_relationship_with_first_endIDENTICAL
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
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
31071InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
M21143/2-27InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
L2088498-11InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
D11-500InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
752-5801-3InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
MIL-P-21143/2InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M21143/2-128?
M21143/2-128 is a PIN,STRAIGHT,HEADLESS.
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 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: September 2026