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MILP21143CLASS1 — PIN,STRAIGHT,HEADLESS

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

MILP21143CLASS1: PIN,STRAIGHT,HEADLESS.

The PIN,STRAIGHT,HEADLESS is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, shear_strength: 3200 DOUBLE POUND, first_end_style: CHAMFERED, hardness_rating: 47.0 ROCKWELL C MINIMUM AND 58.0 ROCKWELL C MAXIMUM OVERALL, second_end_style: RADIUS, special_features: RADIUS END MAY BE CHAMFERED 25.0 DEG. This part is cataloged in the U.S.

Government catalog under NSN 5315-00-543-3986, 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
MILP21143CLASS1
NSN: 5315-00-543-3986
NIINs: 005433986, 006821726, 006821732, 006821746, 007533636
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL OVERALL
shear_strength3200 DOUBLE POUND
first_end_styleCHAMFERED
hardness_rating47.0 ROCKWELL C MINIMUM AND 58.0 ROCKWELL C MAXIMUM OVERALL
second_end_styleRADIUS
special_featuresRADIUS END MAY BE CHAMFERED 25.0 DEG
features_providedCASEHARDENED
surface_treatmentPHOSPHATE ZINC OVERALL
pin_overall_length0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN
pin_overall_diameter0.1251 INCHES MINIMUM AND 0.1253 INCHES MAXIMUM IN
first_end_taper_angle4.0 DEGREES MINIMUM AND 16.0 DEGREES MAXIMUM
first_end_taper_length0.081 INCHES NOMINAL IN
NSN5315-00-543-3986
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MILP21143CLASS1 · 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
•
SURFACE FINISH: 16.0 MICROINCHES OVERALL
•
FIRST END TAPER LENGTH: 0.380 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
FIRST END STYLE: CHAMFERED
•
HARDNESS RATING: 36.0 ROCKWELL C MINIMUM AND 42.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A493 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A582 ASSN STD 2ND MATERIAL RESPONSE OVERALL
•
FIRST END TAPER ANGLE: 4.0 DEGREES MINIMUM AND 16.0 DEGREES MAXIMUM
•
PIN OVERALL DIAMETER: 0.2501 INCHES MINIMUM AND 0.2503 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
SURFACE FINISH16.0 MICROINCHES OVERALL
FIRST END TAPER LENGTH0.380 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
FIRST END STYLECHAMFERED
HARDNESS RATING36.0 ROCKWELL C MINIMUM AND 42.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A493 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A582 ASSN STD 2ND MATERIAL RESPONSE OVERALL
FIRST END TAPER ANGLE4.0 DEGREES MINIMUM AND 16.0 DEGREES MAXIMUM
PIN OVERALL DIAMETER0.2501 INCHES MINIMUM AND 0.2503 INCHES MAXIMUM IN
PIN OVERALL LENGTH1.740 INCHES MINIMUM AND 1.750 INCHES MAXIMUM IN
SECOND END RELATIONSHIP WITH FIRST ENDNOT IDENTICAL
SUBSTITUTES & CROSS-REFERENCES 4
756-31X24 PIECE 25Reference document
Same NSN cross-reference
Reference document — Secondary reference
75656-31X24PIECReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
MS16555-651Reference document
Same NSN cross-reference
Reference document — Secondary reference
5315005433986Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MILP21143CLASS1?
MILP21143CLASS1 is a PIN,STRAIGHT,HEADLESS.
What parts can replace MILP21143CLASS1?
There are 4 known substitutes for MILP21143CLASS1: 756-31X24 PIECE 25, 75656-31X24PIEC, MS16555-651 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MILP21143CLASS1?
MILP21143CLASS1 is cataloged in the U.S. Government catalog under NSN 5315-00-543-3986. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.