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Spiralock® Tap WedgeSpiralock® taps are furnished with ramp angles as shown here. This is referred to as style "BT" for bottom tapping. When tapping from the opposite end of a through hole, you must specify Spiralock style "TT" (top tapping), which has the ramp angle facing the opposite direction.

Cold forming taps produce a thread by deforming material instead of removing it. The starting minor diameter is larger and must be held to a tighter tolerance than with standard taps to ensure the threads fill out properly. Forming taps are suitable for all ductile materials with an elongation value above 10%, such as aluminum, brass, copper, and mild steels. Lubrication with cutting oil is preferred.

Fast Facts:

  • Powdered metallurgy grade of high speed steel
  • Material flows without generating chips and makes threads stronger
  • Lower risk of breakage, particularly in small diameters
  • Plug and bottom chamfer
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    The availability of the products described on this site, and the product descriptions, may vary from country to country. Consult your STANLEY Engineered Fastening Account Executive or your local distributor for specific product information.