Bottom taps made of High Speed Steel have 1-2 chamfered threads. The shortest chamfer for threading close to the bottom of blind holes usually after Plug or Taper style tap is used. Bronze oxide surface treatment. Bright finish polished.

Bottoming taps are used when threads must go to bottom of hole, and are ideal for all general-purpose threading. Bottom taps are also used for tough threading work, routine maintenance, repair and for re-threading.