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MIL-P-21143/2 — 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: CHAMFERED, surface_treatment: PASSIVATE OVERALL, pin_overall_length: 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN, pin_overall_diameter: 0.1560 INCHES MINIMUM AND 0.1562 INCHES MAXIMUM IN, first_end_taper_angle: 45.0 DEGREES NOMINAL. This part is cataloged in the Federal Logistics Information System under NSN 5315-00-823-8767, 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-21143/2
NSN: 5315-00-823-8767
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_styleCHAMFERED
surface_treatmentPASSIVATE OVERALL
pin_overall_length0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
pin_overall_diameter0.1560 INCHES MINIMUM AND 0.1562 INCHES MAXIMUM IN
first_end_taper_angle45.0 DEGREES NOMINAL
first_end_taper_length0.010 INCHES NOMINAL IN
end_item_identification1680-01-545-9281
material_document_and_classificationASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
second_end_relationship_with_first_endIDENTICAL
surface_treatment_document_and_classificationASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
NSN5315-00-823-8767
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MIL-P-21143/2 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 24
756369InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
31071InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
D127InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
3100-0054InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
139866H2CInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
667-0091-000InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLEDGOVERNMENT REGISTRY
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-P-21143/2?
MIL-P-21143/2 is a PIN,STRAIGHT,HEADLESS.
What parts can replace MIL-P-21143/2?
There are 24 known substitutes for MIL-P-21143/2: 756369, 31071, D127 and 21 more. Substitute compatibility should be verified for your specific system.
Is MIL-P-21143/2 still available?
MIL-P-21143/2 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: September 2026