4TRADE Bolt & Nut M6 x 40 Din Cup Square Hexagon Bright Zinc Plated PK5

This bolt has a square shoulder under a rounded head (Mushroom Head) which resists turning when the nut is tightened or removed. The bolt is driven into a hole the same size as the shank and then hammered the rest of the way, where the square shoulder locks firmly into place. Use when ever a smooth finish surface is required Zinc plated, reducing the corrosion rate in normal atmoshere Supplied with nut Available in a range of sizes and lengths