Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW
The 500 L 166.020 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-019-3257, 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.
SCREW MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-633-CANCELLED FED SPEC 1ST MATERIAL RESPONSE OR QQ-W-409,GRADE 2,3 OR 4 FED SPEC 2ND MATERIAL RESPONSE
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HEAD DIAMETER: 0.256 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN
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FASTENER LENGTH: 0.250 INCHES NOMINAL IN
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SCREW SURFACE TREATMENT: CADMIUM AND CHROMATE OR ZINC AND CHROMATE
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HEAD STYLE: PAN NO. 2
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SCREW MATERIAL: STEEL
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTION
RIGHT-HAND
THREAD CLASS
2A A
SCREW MATERIAL DOCUMENT AND CLASSIFICATION
QQ-S-633-CANCELLED FED SPEC 1ST MATERIAL RESPONSE OR QQ-W-409,GRADE 2,3 OR 4 FED SPEC 2ND MATERIAL RESPONSE
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FREQUENTLY ASKED QUESTIONS
What is 500 L 166.020?
500 L 166.020 is a 500 L 166.020.
What parts can replace 500 L 166.020?
There are 9 known substitutes for 500 L 166.020: 193257, 2002955, 10-91243-4 and 6 more. Substitute compatibility should be verified for your specific system.
Is 500 L 166.020 still available?
500 L 166.020 is currently cancelled.
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