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Technical Data Sheet
PartsTable / COMPONENT / MIL-T-781C
MIL-T-781C ✓ 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,HEADED 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 5315-01-558-5317, 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-T-781C
NSN: 5315-01-558-5317
FSC: 5315
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part NumberMIL-T-781C
NSN5315-01-558-5317
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MIL-T-781C · 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 5
2123919-1Interchangeable
interchangeable cross-reference
interchangeable
150-6408432 FINInterchangeable
interchangeable cross-reference
interchangeable
128-4VMInterchangeable
interchangeable cross-reference
interchangeable
3560976Interchangeable
Same NIIN cross-reference
interchangeable
MS51844DInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-T-781C?
MIL-T-781C is a PIN,STRAIGHT,HEADED.
What parts can replace MIL-T-781C?
There are 5 known substitutes for MIL-T-781C: 2123919-1, 150-6408432 FIN, 128-4VM and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-T-781C?
MIL-T-781C is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-558-5317. 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