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PartsTable / COMPONENT / 40337R1
40337R1 ✓ 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. Key specifications include special_features: MRAP MAXXPRO, end_item_identification: MRAP - UNIQUE NSN - USED ON 2 MRAP VARIANTS, part_name_assigned_by_controlling_agency: NUT, 3-48. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-556-6526, 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
40337R1
NSN: 5310-01-556-6526
FSC: 5310
CAGE: 338X5 — ND DEFENSE LLC (USA)
SPECIFICATIONS
special_featuresMRAP MAXXPRO
end_item_identificationMRAP - UNIQUE NSN - USED ON 2 MRAP VARIANTS
part_name_assigned_by_controlling_agencyNUT, 3-48
NSN5310-01-556-6526
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 40337R1 · 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
TECHNICAL CHARACTERISTICS (FLIS)
PART NAME ASSIGNED BY CONTROLLING AGENCYNUT, 3-48
END ITEM IDENTIFICATIONMRAP - UNIQUE NSN - USED ON 2 MRAP VARIANTS
SPECIAL FEATURESMRAP MAXXPRO
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
926146Interchangeable
interchangeable cross-reference
interchangeable
PT146Interchangeable
interchangeable cross-reference
interchangeable
4104Interchangeable
interchangeable cross-reference
interchangeable
36007Interchangeable
interchangeable cross-reference
interchangeable
33663Interchangeable
interchangeable cross-reference
interchangeable
N33663Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 40337R1?
40337R1 is a NUT,PLAIN,HEXAGON.
What parts can replace 40337R1?
There are 6 known substitutes for 40337R1: 926146, PT146, 4104 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 40337R1?
40337R1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-556-6526. 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