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31083R1 ✓ 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

NUT,PLAIN,EXTENDED WASHER,HEXAGO. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-556-5555, 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
31083R1
NSN: 5310-01-556-5555
FSC: 5310
CAGE: 89346 — NAVISTAR INTL CORP TRUCK BR OHIO PLANT (USA)
SPECIFICATIONS
Part Number31083R1
NSN5310-01-556-5555
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 31083R1 · 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
C449Interchangeable
interchangeable cross-reference
interchangeable
40166Interchangeable
interchangeable cross-reference
interchangeable
648690Interchangeable
interchangeable cross-reference
interchangeable
400230Interchangeable
interchangeable cross-reference
interchangeable
2214569Interchangeable
interchangeable cross-reference
interchangeable
16072PCM358Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 31083R1?
31083R1 is a NUT,PLAIN,EXTENDED WASHER,HEXAGO.
What parts can replace 31083R1?
There are 24 known substitutes for 31083R1: C449, 40166, 648690 and 21 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 31083R1?
31083R1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-556-5555. 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