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 NE SERIES ZINC
Web Price $118.70
GRADE A NYLON INSERT LOCKNUT, ZINC CLEAR CR+3 (INCH)

1/4-28 NYLON INSERT LOCK NUT NE SERIES ZINC
Web Price $157.03
GRADE A NYLON INSERT LOCKNUT, ZINC CLEAR CR+3 (INCH)

1/4-20 NYLON INSERT LOCK NUT NE SERIES ZINC
Web Price $5.59
GRADE A NYLON INSERT LOCKNUT, ZINC CLEAR CR+3 (INCH)

1/4-28 NYLON INSERT LOCK NUT NE SERIES ZINC
Web Price $11.97
GRADE A NYLON INSERT LOCKNUT, ZINC CLEAR CR+3 (INCH)

5/16-18 NYLON INSERT LOCK NUT NE SERIES ZINC
Web Price $138.21
Diameter N/A 1/4 N/A 1/4 N/A 1/4 N/A 1/4 N/A 5/16
Pitch N/A Coarse N/A Fine N/A Coarse N/A Fine N/A Coarse
Length N/A
Material N/A Carbon Steel
Finish N/A Zinc Plated
Package Quantity N/A 3500 N/A 3500 N/A 100 N/A 100 N/A 3000