Chamfer Type

Chamfers are the tapered or incomplete threads at the front of the tap.

  • Bottoming

    Bottoming chamfers have 1 to 2 tapered threads and are only used in blind holes where the threads must come as close to the bottom of the hole as possible.

  • Modified Bottoming

    Modified Bottoming chamfers have 2-1/2 to 4 tapered threads and are used in through holes and holes where there is sufficient room at the bottom. These are usually found only on high performance taps.

  • Plug

    Plug chamfers have 3 to 5 tapered threads and are used in through holes and holes where there is sufficient room at the bottom.

  • Semi-bottoming

    Semi-Bottoming chamfers have 2 to 2-1/2 tapered threads and are used in blind holes where slightly more length is needed than a standard bottoming chamfer. These are usually found only on high performance taps.

  • Taper

    Taper chamfers have 7 to 10 tapered threads and are used for starting threads and for through holes.