Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW
The BOLT,MACHINE 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 5306-01-387-7335, 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 21878N PC28?
21878N PC28 is a BOLT,MACHINE.
What parts can replace 21878N PC28?
There are 14 known substitutes for 21878N PC28: 19-130-4282, 9131-001, 6515NCM020564 and 11 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21878N PC28?
21878N PC28 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-01-387-7335. This indicates validated use in U.S. government and defense supply chains.
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