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PartsTable / COMPONENT / MIL-R-15917-IV-BR-MILGP IT NO 56
MIL-R-15917-IV-BR-MILGP IT NO 56 ✓ 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 NUT,SELF-LOCKING,HEXAGON 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 5310-01-610-1497, 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-R-15917-IV-BR-MILGP IT NO 56
NSN: 5310-01-610-1497
FSC: 5310
CAGE: 52173 — REELCRAFT INDUSTRIES INC (USA)
SPECIFICATIONS
Part NumberMIL-R-15917-IV-BR-MILGP IT NO 56
NSN5310-01-610-1497
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MIL-R-15917-IV-BR-MILGP IT NO 56 · 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 19
4981981-6Interchangeable
interchangeable cross-reference
interchangeable
S4034Interchangeable
interchangeable cross-reference
interchangeable
4981981Interchangeable
interchangeable cross-reference
interchangeable
1728050Interchangeable
interchangeable cross-reference
interchangeable
S-4034-1Interchangeable
interchangeable cross-reference
interchangeable
MIL-R-15917-IV-BR-MILGPInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-R-15917-IV-BR-MILGP IT NO 56?
MIL-R-15917-IV-BR-MILGP IT NO 56 is a NUT,SELF-LOCKING,HEXAGON.
What parts can replace MIL-R-15917-IV-BR-MILGP IT NO 56?
There are 19 known substitutes for MIL-R-15917-IV-BR-MILGP IT NO 56: 4981981-6, S4034, 4981981 and 16 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-R-15917-IV-BR-MILGP IT NO 56?
MIL-R-15917-IV-BR-MILGP IT NO 56 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-610-1497. 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