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Technical Data Sheet
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0400391 ✓ 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,PLAIN,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 5310-01-556-4488, 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
0400391
NSN: 5310-01-556-4488
FSC: 5310
CAGE: 32MY9 — MILLER INDUSTRIES TOWING EQUIPMENT INC (USA)
SPECIFICATIONS
Part Number0400391
NSN5310-01-556-4488
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 0400391 · 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 21
3N177PC102Interchangeable
interchangeable cross-reference
interchangeable
120377Interchangeable
interchangeable cross-reference
interchangeable
3N135PC102Interchangeable
interchangeable cross-reference
interchangeable
MS35690-622Interchangeable
interchangeable cross-reference
interchangeable
5310000171544Interchangeable
interchangeable cross-reference
interchangeable
1C6175P22Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 0400391?
0400391 is a NUT,PLAIN,HEXAGON.
What parts can replace 0400391?
There are 21 known substitutes for 0400391: 3N177PC102, 120377, 3N135PC102 and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 0400391?
0400391 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-556-4488. 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