4mm Hex Lock Nut Aluminum, Black Oxide 18-8 Stainless 7mm Hex.

Description:

• Nut with a metric thread pitch and 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 is subjected to vibration.
• The nylon insert comes in a various of colors.

Hardness:

• Rockwell: B95 - C32

Items needed:

• 7mm Socket, or wrench needed.

Includes:

• 10pcs of 4mm hex lock nut, black oxide stainless 18-8.