Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW
NUT,PLAIN,EXTENDED WASHER,HEXAGO. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-503-5329, 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
21LFHU-51618
NSN:5310-01-503-5329 FSC:5310 CAGE:82465 — MAC LEAN FOGG LOCK NUT CO (USA)
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FREQUENTLY ASKED QUESTIONS
What is 21LFHU-51618?
21LFHU-51618 is a NUT,PLAIN,EXTENDED WASHER,HEXAGO.
What parts can replace 21LFHU-51618?
There are 11 known substitutes for 21LFHU-51618: 219243, 135258, 0740074 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21LFHU-51618?
21LFHU-51618 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-503-5329. This indicates validated use in U.S. government and defense supply chains.
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