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PartsTable / COMPONENT / 40737-2 PC NO 21
40737-2 PC NO 21 ✓ 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 material: NICKEL ALLOY OVERALL, end_item_identification: VALVE PRESS REGG 4.00 IPS 33T55PSI FLGE BRZ. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-524-9864, 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
40737-2 PC NO 21
NSN: 5310-01-524-9864
FSC: 5310
CAGE: 55378 — TRAC REGULATOR CO., INC. DBA TRAC REGULATOR CO INC (USA)
SPECIFICATIONS
materialNICKEL ALLOY OVERALL
end_item_identificationVALVE PRESS REGG 4.00 IPS 33T55PSI FLGE BRZ
NSN5310-01-524-9864
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 40737-2 PC NO 21 · 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
KEY FEATURES
•
MATERIAL: NICKEL ALLOY OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALNICKEL ALLOY OVERALL
END ITEM IDENTIFICATIONVALVE PRESS REGG 4.00 IPS 33T55PSI FLGE BRZ
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
16456Interchangeable
interchangeable cross-reference
interchangeable
5004-170Interchangeable
interchangeable cross-reference
interchangeable
10520-1Interchangeable
interchangeable cross-reference
interchangeable
5938632Interchangeable
interchangeable cross-reference
interchangeable
5310PL0769015Interchangeable
interchangeable cross-reference
interchangeable
6515NCM105580Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 40737-2 PC NO 21?
40737-2 PC NO 21 is a NUT,PLAIN,HEXAGON.
What parts can replace 40737-2 PC NO 21?
There are 7 known substitutes for 40737-2 PC NO 21: 16456, 5004-170, 10520-1 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 40737-2 PC NO 21?
40737-2 PC NO 21 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-524-9864. 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