日本东洋丝锥厂(东洋タツプ制作所),生产了一种GNT螺旋槽丝锥。其特点是:(1)由于切屑是由丝锥的螺旋槽的后方顺利地排出,故在深孔和盲孔攻丝时,也能保持切削刃的锋利;几乎没有切屑堵塞和丝锥的折损现象。(2)攻丝力矩比普通丝锥的力矩小,故耐用度高、切削性能良好。加工的螺纹精度好。(3)即使是对难加工材料(不锈钢、锻件)也能容易地攻丝。规格: Japan Toyo Taps Factory (Toyo Tupo Co., Ltd.) produced a GNT spiral groove tap. Its features are: (1) As the chip is smoothly discharged from the rear of the spiral groove of the tap, the sharpness of the cutting edge can be maintained even when the deep hole and the blind hole are tapped; there is almost no chip blocking and tap breakage . (2) Tapping moment than ordinary tap torque, so durability, cutting performance is good. Processing thread accuracy is good. (3) Easy tapping even for difficult-to-machine materials (stainless steel, forgings). specification: