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 43520/57783 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 5310-01-357-3053, 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.
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FREQUENTLY ASKED QUESTIONS
What is 43520/57783?
43520/57783 is a 43520/57783.
What parts can replace 43520/57783?
There are 4 known substitutes for 43520/57783: 43520, 42254, 94244 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 43520/57783?
43520/57783 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-357-3053. This indicates validated use in U.S. government and defense supply chains.
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