Nylon inset lock nuts nuts are basically a hex nut with a nylon-filled collar at its back end. When a screw reaches the collar, the threads and nylon form a tight, frictional fit, restricting movement of the screw when it's subject to vibration.
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GRADE A NYLON INSERT LOCKNUT, ZINC YELLOW CR+6 (INCH)

1/4-20 NYLON INSERT LOCK NUT NE SERIES YELLOW ZINC
Web Price $211.71
GRADE A NYLON INSERT LOCKNUT, ZINC YELLOW CR+6 (INCH)

5/16-18 NYLON INSERT LOCK NUT NE SERIES YELLOW ZINC
Web Price $233.42
GRADE A NYLON INSERT LOCKNUT, ZINC YELLOW CR+6 (INCH)

7/16-14 NYLON INSERT LOCK NUT NE SERIES YELLOW ZINC
Web Price $303.82
GRADE A NYLON INSERT LOCKNUT, ZINC YELLOW CR+6 (INCH)

1/2-13 NYLON INSERT LOCK NUT NE SERIES YELLOW ZINC
Web Price $221.29
GRADE A NYLON INSERT LOCKNUT, ZINC YELLOW CR+6 (INCH)

5/8-11 NYLON INSERT LOCK NUT NE SERIES YELLOW ZINC
Web Price $250.95
Diameter N/A 1/4 N/A 5/16 N/A 7/16 N/A 1/2 N/A 5/8
Pitch N/A Coarse
Length N/A
Material N/A Carbon Steel
Finish N/A Yellow Zinc Plated
Package Quantity N/A 5000 N/A 4000 N/A 2000 N/A 1000 N/A 550