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 CLEAR CR+3 (INCH)

1/4-20 NYLON INSERT LOCK NUT NTU SERIES ZINC
Web Price $312.72
GRADE A NYLON INSERT LOCKNUT, ZINC CLEAR CR+3 (INCH)

5/16-18 NYLON INSERT LOCK NUT NTU SERIES ZINC
Web Price QUOTE
GRADE A NYLON INSERT LOCKNUT, ZINC CLEAR CR+3 (INCH)

3/8-16 NYLON INSERT LOCK NUT NTU SERIES ZINC
Web Price QUOTE
GRADE A NYLON INSERT LOCKNUT, ZINC CLEAR CR+3 (INCH)

7/16-14 NYLON INSERT LOCK NUT NTU SERIES ZINC
Web Price $455.81
GRADE A NYLON INSERT LOCKNUT, ZINC CLEAR CR+3 (INCH)

1/2-13 NYLON INSERT LOCK NUT NTU SERIES ZINC
Web Price $263.73
Diameter N/A 1/4 N/A 5/16 N/A 3/8 N/A 7/16 N/A 1/2
Pitch N/A Coarse
Length N/A
Material N/A Carbon Steel
Finish N/A Zinc Plated
Package Quantity N/A 3000 N/A 2000 N/A 1200 N/A 850 N/A 500