LITTLE KNOWN FACTS ABOUT TYPES OF SCREW HEADS.

to supply even more defense a chemical passivation is placed on the zinc coating. This is often a chemical chromate that ends in a yellow colour as well as a more challenging area. This screw end is commonly abbreviated to “ZYP” or Zinc and Yellow Passivated. The lack of centring signifies that the screwdriver little bit can slip (‘cam-out�