Hand threading taps, also called straight-flute taps, have straight flutes and collect chips in the straight flutes of the tool. These commonly used taps are designed to create threads in blind or through holes, and can be used with both machine and hand tools.
Pipe taps are designed to create threads in pipes and pipe fittings.
Spiral flute threading taps push chips away from the tap and out of the hole, so they don't get packed at the bottom of the hole or in the flutes. These taps are the best choice for creating threads in blind holes.
Spiral point threading taps, also called “gun taps,” push chips through the hole ahead of the tool, reducing loading and clogging in the flutes. Spiral point taps are stronger than hand taps, and are the best choice for creating threads in through holes.
Thread forming threading taps, also called cold forming taps, press rather than cut threads in a pre-drilled hole, and no chips are created.