目前,我国螺纹标准正处于新、旧标准过渡时期,同时,我国又引进了许多带有统一英制螺纹的技术资料及设备。了解和掌握新、旧国际普通螺纹及统一英制螺纹的特点、对螺纹量规及各种螺纹刀具的设计十分必要。一、几种标准螺纹的主要共同点统一英制螺纹与新、旧国标普通螺纹的基本牙型完全相同。它们都是等边三角形,牙型角都是60°,原始三角形高度H及螺纹基本尺寸的计算亦相同。 At present, China’s thread standards are in the transition period of new and old standards. At the same time, China has introduced many technical materials and equipment with a unified British thread. To understand and grasp the new and old international common thread and the characteristics of a unified British thread, thread gauge and a variety of thread cutter design is necessary. First, the main common thread of several standard threads Unified British thread and the new national standard thread ordinary tooth basic identical. They are equilateral triangles, tooth angle is 60 °, the original triangle height H and basic thread size calculation is also the same.