丝锥钻孔尺寸
计算攻丝应用的丝锥钻孔尺寸
这些计算以理论值为基础，仅供计划之用。实际结果会有所不同。Kennametal 不承担任何责任。
Suggested Percentages of Full Thread in Tapped Holes
A common internal thread, drilled so that it results in 50% of full thread will break the external thread, before the internal thread will strip. A common internal thread drilled out so that it contains 100% of full thread is only 5% stronger than a 75% height of thread, yet it requires 3 times the power to tap.