The difference between extrusion taps and nut taps.

A brief introduction to taps

A cutting tool for processing internal threads, with grooves along the axial direction. Also known as a Spiral Flute Taps. Taps are classified into straight groove taps, helical groove taps and tip taps (end taps) according to their shapes. Straight groove taps are easy to process, but have slightly lower precision and higher output. It is generally used for thread processing on ordinary lathes, drilling machines and tapping machines, and the cutting speed is relatively slow. Helical groove taps are mostly used for drilling blind holes in CNC machining centers. They feature fast processing speed, high precision, good chip removal and good centering.

The front part of the screw tip tap has a slotting groove, which is used for processing through holes. Most of the taps provided by tool factories are coated taps, which have a significantly improved service life and cutting performance compared to uncoated taps. The cutting load distribution of taps with unequal diameter design is reasonable, and the processing quality is high, but the manufacturing cost is also high. Trapezoidal thread taps often adopt unequal diameter design.

The difference between the two

The rolling tap is made of high-quality high-speed steel and is prefabricated with lubrication grooves and TIN-coated for special purposes. The square shaft at the tail of the tap is an optimized design for transmitting the torque required for tapping.

Compared with the threads processed by traditional nut taps, the threads processed by extrusion taps have extremely high strength. It does not form threads by cutting the particle structure of the material. Instead, due to the special geometric structure of the tap, the material is squeezed and redistributed to form threads. This extrusion molding process not only does not damage the inherent fiber direction of the metal, but on the contrary, it makes the metal material more compact and solid. Therefore, the threads processed by extrusion taps have mechanical characteristics that can resist relatively large tensile forces and torques.

Extrusion taps are ideal taps for processing threads after drilling with hot melt drill bits. The bushing formed by hot-melt drilling can be extruded and redistributed by the extrusion tap to form threads even at the thin-walled part at the lower end of the bushing, effectively ensuring the strength of the threads.