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Technical Data Sheet
PartsTable / COMPONENT / MIL-P-21143
MIL-P-21143 ✓ 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 PIN,STRAIGHT,HEADLESS is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OR STEEL COMP 416 OR STEEL COMP 410 OVERALL, shear_strength: 45000 DOUBLE POUNDS PER SQUARE INCH, surface_finish: 16.0 MICROINCHES OUTSIDE DIAMETER, first_end_style: CHAMFERED, hardness_rating: 36.0 ROCKWELL C MINIMUM AND 42.0 ROCKWELL C MAXIMUM OVERALL, second_end_style: RADIUS. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-010-3696, 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-P-21143
NSN: 5315-00-010-3696
FSC: 5315
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL COMP 303 OR STEEL COMP 416 OR STEEL COMP 410 OVERALL
shear_strength45000 DOUBLE POUNDS PER SQUARE INCH
surface_finish16.0 MICROINCHES OUTSIDE DIAMETER
first_end_styleCHAMFERED
hardness_rating36.0 ROCKWELL C MINIMUM AND 42.0 ROCKWELL C MAXIMUM OVERALL
second_end_styleRADIUS
special_featuresHARDNESS OF 75-83HRB OR EQUIVALENT FOR TYPE 303 STEEL.
features_providedCASEHARDENED
surface_treatmentPASSIVATE OVERALL
pin_overall_length2.090 INCHES MINIMUM AND 3.010 INCHES MAXIMUM IN
pin_overall_diameter0.6251 INCHES MINIMUM AND 0.6253 INCHES MAXIMUM IN
first_end_taper_angle4.0 DEGREES MINIMUM AND 16.0 DEGREES MAXIMUM
NSN5315-00-010-3696
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MIL-P-21143 · 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 DOCUMENT AND CLASSIFICATION: ASTM A108,UNS G11110 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A108,UNS G11120 ASSN STD 2ND MATERIAL RESPONSE OR ASTM A108,UNS G11130 ASSN STD 3RD MATERIAL RESPONSE OVERALL
•
MATERIAL: STEEL OVERALL
•
SPECIFICATION/STANDARD DATA: 81349-MIL-P-21143 GOVERNMENT SPECIFICATION AND 24617-103696 MANUFACTURERS STANDARD
•
DEPARTURE FROM CITED DESIGNATOR: AS MODIFIED BY 0.010 IN. CHAMFER AND PIN DIA IN
•
HARDNESS RATING: 40.0 ROCKWELL C MINIMUM AND 58.0 ROCKWELL C MAXIMUM OVERALL
•
PIN OVERALL DIAMETER: 0.1230 INCHES MINIMUM AND 0.1250 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
FIRST END STYLESQUARE
SECOND END RELATIONSHIP WITH FIRST ENDIDENTICAL
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A108,UNS G11110 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A108,UNS G11120 ASSN STD 2ND MATERIAL RESPONSE OR ASTM A108,UNS G11130 ASSN STD 3RD MATERIAL RESPONSE OVERALL
MATERIALSTEEL OVERALL
SPECIFICATION/STANDARD DATA81349-MIL-P-21143 GOVERNMENT SPECIFICATION AND 24617-103696 MANUFACTURERS STANDARD
DEPARTURE FROM CITED DESIGNATORAS MODIFIED BY 0.010 IN. CHAMFER AND PIN DIA IN
HARDNESS RATING40.0 ROCKWELL C MINIMUM AND 58.0 ROCKWELL C MAXIMUM OVERALL
PIN OVERALL DIAMETER0.1230 INCHES MINIMUM AND 0.1250 INCHES MAXIMUM IN
SHEAR STRENGTH2600 DOUBLE POUND
PIN OVERALL LENGTH1.238 INCHES MINIMUM AND 1.262 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
141119Interchangeable
interchangeable cross-reference
interchangeable
KC-59-512Interchangeable
interchangeable cross-reference
interchangeable
1000-0013Interchangeable
interchangeable cross-reference
interchangeable
PL29AInterchangeable
interchangeable cross-reference
interchangeable
MIL-P-21143Interchangeable
interchangeable cross-reference
interchangeable
8P15-200-253Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-P-21143?
MIL-P-21143 is a PIN,STRAIGHT,HEADLESS.
What parts can replace MIL-P-21143?
There are 19 known substitutes for MIL-P-21143: 141119, KC-59-512, 1000-0013 and 16 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-P-21143?
MIL-P-21143 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-010-3696. 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