Metric nylon inset lock 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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METRIC STAINLESS A4 80 NYLON INSERT THIN LOCKNUT, DIN 985

M4-0.70 METRIC NYLON INSERT LOCK NUT DIN 985 A4-80 STAINLESS
Web Price $602.44
METRIC STAINLESS A4 80 NYLON INSERT THIN LOCKNUT, DIN 985

M4-0.70 METRIC NYLON INSERT LOCK NUT DIN 985 A4-80 STAINLESS
Web Price QUOTE
METRIC STAINLESS A4 80 NYLON INSERT THIN LOCKNUT, DIN 985

M5-0.80 METRIC NYLON INSERT LOCK NUT DIN 985 A4-80 STAINLESS
Web Price $359.31
METRIC STAINLESS A4 80 NYLON INSERT THIN LOCKNUT, DIN 985

M5-0.80 METRIC NYLON INSERT LOCK NUT DIN 985 A4-80 STAINLESS
Web Price $5.85
METRIC STAINLESS A4 80 NYLON INSERT THIN LOCKNUT, DIN 985

M6-1.00 METRIC NYLON INSERT LOCK NUT DIN 985 A4-80 STAINLESS
Web Price $272.69
Diameter N/A M4 N/A M4 N/A M5 N/A M5 N/A M6
Pitch N/A Coarse
Length N/A
Material N/A A4-80 Stainless
Finish N/A Plain
Package Quantity N/A 15000 N/A 100 N/A 8000 N/A 100 N/A 4000