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.
Unit of Measure
Items
STAINLESS 316 NYLON INSERT LOCKNUT (INCH)

1/4-20 NYLON INSERT LOCK NUT NE SERIES 316 STAINLESS
Web Price $736.47

STAINLESS 316 NYLON INSERT LOCKNUT (INCH)

1/4-28 NYLON INSERT LOCK NUT NE SERIES 316 STAINLESS
Web Price $1,164.06

STAINLESS 316 NYLON INSERT LOCKNUT (INCH)

1/4-20 NYLON INSERT LOCK NUT NE SERIES 316 STAINLESS
Web Price $13.73

STAINLESS 316 NYLON INSERT LOCKNUT (INCH)

1/4-28 NYLON INSERT LOCK NUT NE SERIES 316 STAINLESS
Web Price $21.66

STAINLESS 316 NYLON INSERT LOCKNUT (INCH)

5/16-18 NYLON INSERT LOCK NUT NE SERIES 316 STAINLESS
Web Price $729.36
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 316 Stainless
Finish N/A Plain
Package Quantity N/A 7000 N/A 7000 N/A 100 N/A 100 N/A 5000