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 CLASS 8 NYLON INSERT LOCKNUT, ZINC YELLOW CR+6

M4-0.70 METRIC NYLON INSERT LOCK NUT DIN 985 CLASS 8 YELLOW ZINC
Web Price $143.59
METRIC CLASS 8 NYLON INSERT LOCKNUT, ZINC YELLOW CR+6

M5-0.80 METRIC NYLON INSERT LOCK NUT DIN 985 CLASS 8 YELLOW ZINC
Web Price $145.95
METRIC CLASS 8 NYLON INSERT LOCKNUT, ZINC YELLOW CR+6

M6-1.00 METRIC NYLON INSERT LOCK NUT DIN 985 CLASS 8 YELLOW ZINC
Web Price $109.80
METRIC CLASS 8 NYLON INSERT LOCKNUT, ZINC YELLOW CR+6

M8-1.25 METRIC NYLON INSERT LOCK NUT DIN 985 CLASS 8 YELLOW ZINC
Web Price $302.30
METRIC CLASS 8 NYLON INSERT LOCKNUT, ZINC YELLOW CR+6

M8-1.00 METRIC NYLON INSERT LOCK NUT DIN 985 CLASS 8 YELLOW ZINC
Web Price $271.53
Diameter N/A M4 N/A M5 N/A M6 N/A M8 N/A M8
Pitch N/A Coarse N/A Coarse N/A Coarse N/A Coarse N/A Fine
Length N/A
Material N/A Class 8
Finish N/A Yellow Zinc Plated
Package Quantity N/A 5000 N/A 5000 N/A 3500 N/A 4000 N/A 4000