The most common tap straight flute taps, spiral flute tap, tip tap, tap squeeze its performance strengths.

     Straight flute tap, tapping: It is the most versatile, through-hole or blind hole, non-ferrous metal or black metal can be processed, the cheapest price. But the targeted poor, what can be done, nothing is done best. Cone 2,4,6 teeth portion may have a short tapered blind hole for a long taper for through holes. As long as the bottom hole deep enough, you should try to use some of the Cone long, so share the load of gear cutting some more, life is also longer.

     Spiral flute tap, tapping: more suitable for machining blind hole thread, discharge machining chips backwards, because the helix angle of the reason, tap actual cutting rake angle will increase with the helix angle increases. Experience tells us: the processing of ferrous metals, helix angle selected smaller, generally around 30 degrees, to ensure the strength of the helical teeth. Processing of non-ferrous metals, helix angle selected larger, can be about 45 degrees, cutting some sharp.

     Tip tap tapping: the processing thread chips forward discharge. Its design is relatively large core size, good strength, can withstand greater cutting forces. Processing of non-ferrous metals, stainless steel, black metallic effects are good, the through-hole threaded tip tap should be given priority.

     Extrusion tap, tapping: more suitable for processing non-ferrous metals, and the cutting tap works different, it is a metal extrusion, making plastic deformation, the formation of an internal thread. Metal fiber thread is continuous extrusion, tensile shear strength teach high surface roughness processing also teach, but require higher extrusion tap Bottom: too large, base metals less, resulting in the thread trail is too large, the strength is not enough. Too small, enclosed metal extrusion nowhere to go, resulting in broken tap. Calculated as: Bottom diameter = nominal diameter of the thread pitch -0.5.