M3 x 0.5mm Nylon Insert Hex Lock Nuts, Carbon Steel Black Zinc Plated, Pack of 50

1. Nylon-insert lock nut, polymer-insert lock nut, or elastic stop nut, is a kind of locknut.
2. It is a nut with a nylon collar insert that resists turning.
3. The plastic insert is placed at the end of the nut, and its inner diameter (ID) is slightly smaller than the major diameter of the screw.
4. The insert deforms elastically over the threads of the screw, but threads are not cut into the nylon.

Specification:
Material: Carbon Steel
Finish: Black zinc plated
Thread Size: M3
Pitch: 0.5 mm
Hex Width: 5.5 mm / 0.22"
Height: 4mm / 0.16"
Package Content: 50(+/-2%) x Hex Lock Nuts