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 57029 ITEM 221 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 5315-01-137-4393, 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
57029 ITEM 221
NSN:5315-01-137-4393 FSC:5315 CAGE:9Y580 — L3HARRIS TECHNOLOGIES, INC. (USA)
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FREQUENTLY ASKED QUESTIONS
What is 57029 ITEM 221?
57029 ITEM 221 is a 57029 ITEM 221.
What parts can replace 57029 ITEM 221?
There are 4 known substitutes for 57029 ITEM 221: 672111, DM5473W, UEF3685 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 57029 ITEM 221?
57029 ITEM 221 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-137-4393. This indicates validated use in U.S. government and defense supply chains.
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