Thread Forming Tap

Thread forming tap is suitable for processing of non-ferrous metals, and the working principle of the cutting tap is different. it is carried out on the metal extrusion and  plastic deformation, finally forming the internal thread. Extrusion forming the internal thread of metal fibre is continuous, tensile and shear strength is higher, work surface roughness is better also, but squeeze taps required high bottom hole, too big, base metal quantity is little, causing large diameter internal thread transgressions, strength is not enough. Too small, the metal that is enclosed is nowhere to go, causing the tap to break.

The calculation is: The diameter of the bottom hole = the diameter of the internal thread-0.5 screw pitch.