RS PRO Bright Zinc Plated, Clear Passivated Steel Countersunk Head Thread Forming Screw, M4 x 8mm Long

Thread Forming Screws for Metal. Thread forming screws for metal having a tri-lobular cross-section capable of forming or rolling a metric thread into the material into which they are installed. Ideal for use with pre-drilled or punched holes in a wide range of ductile metals Case hardened carbon steel, bright zinc plated ; passivated Available in either Pan head or Countersunk head forms Supplied in bags of 100, ; also available as kit of 250 assorted pan head screws. The kit contains 50 of each of the following sizes of pan head screws: M3 x 5, M3 x 10, M4 x 6, M4 x 10, M4 x 12