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Self Tapping Metal Screws

The phrase Self Tapping Metal Screws may refer to either thread rolling screws or self drilling tek screws, both of which form the mating thread on installation. A seperate tapping operation is therefore not required.

Thread rolling screws incorporate an ISO metric machine type thread. The triangular shaped tip design allows the thread rolling screw to cold form the female thread. These items are manufactured to DIN 7500, a standard that covers several head and drive types.

Self drilling tek screws are designed to drill and tap their own fixing hole, again reducing the number of operations required to make the joint. There are a number of different variants available specific to the task at hand. The examples below are for metal to metal operations.

Fastener Material Key
Evoshield® - A special triple layered ceramic surface coating developed by Evolution to prevent corrosion in pollutive and atmospheric conditions.
A2 Stainless Steel - Also known as grade 304 or 18/8. A general purpose grade of stainless steel.
A4 Stainless Steel - Also known as grade 316 or 18/8/3. A higher corrosion resistant, marine grade of stainless steel.
Bright Zinc Plated (BZP) Steel - Non-stainless standard steel grade offering a basic level of corrosion resistance.