Tap and die
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In the context of threading, taps and dies are two classes of tools used to create or repair screw threads. A tap is used to cut or form the female portion of the mating pair. A die is a cutting tool
Various taps.
A tap and "T" wrench
Various tap handles (wrenches).
A spiral point plug tap ("gun" tap).
Countersink
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In manufacturing, a countersink is a conical hole cut into a manufactured object, or the cutter used to cut such a hole. A common use is to allow the head of a countersunk bolt, screw or rivet, when p
Tap and die
…Whether manual or automatic, the processing of tapping begins with forming (usually by drilling) and slightly countersinking a hole to a diameter somewhat smaller than the tap's major diameter. The correct cut tap hole diameter is listed on a drill and tap size chart, a…
Side and end view of a Weldon style "zero flute" countersink
Side and end view of a 4-fluted countersink