LITTLE KNOWN FACTS ABOUT TYPES OF SCREW HEADS.

to supply more defense a chemical passivation is placed on the zinc coating. This is actually a chemical chromate that results in a yellow colour as well as a more durable surface. This screw end is commonly abbreviated to “ZYP” or Zinc and Yellow Passivated. This design and style makes use of a looped head for where it attaches, making it a s