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Technical Data Sheet
4990-D ITEM 12 ✓ 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 5310-01-354-7656, 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
4990-D ITEM 12
NSN: 5310-01-354-7656
FSC: 5310
CAGE: 17798 — LEBUS INTERNATIONAL, INC. (USA)
SPECIFICATIONS
Part Number4990-D ITEM 12
NSN5310-01-354-7656
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 4990-D ITEM 12 · 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 12
2N4416Interchangeable
interchangeable cross-reference
interchangeable
353739Interchangeable
interchangeable cross-reference
interchangeable
31117Interchangeable
interchangeable cross-reference
interchangeable
382 10-24 UNCInterchangeable
interchangeable cross-reference
interchangeable
3528Interchangeable
interchangeable cross-reference
interchangeable
125242Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4990-D ITEM 12?
4990-D ITEM 12 is a NUT,PLAIN,HEXAGON.
What parts can replace 4990-D ITEM 12?
There are 12 known substitutes for 4990-D ITEM 12: 2N4416, 353739, 31117 and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4990-D ITEM 12?
4990-D ITEM 12 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-354-7656. This indicates validated use in U.S. government and defense supply chains.
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