常用规格有:
螺纹直径:1/8-40 5/32-32 3/16-24 1/4-20 5/16-18 3/8-16 7/16-14 1/2-12 5/8-11 3/4-10 7/8-9 1-8
螺纹长度(寸):1/4 3/8 1/2 5/8 3/4 1 1-1/4 1-1/2 1-3/4 2 2-1/2 2-1/2 2-3/4 3 3-1/4 3-1/2 4 4-1/2 5 5-1/2 6 6-1/2 7 8 9 10
