螺纹规格 d×p k×d 钢丝螺套安 装后长度 L(mm) 钻头直径 do(mm) 自由状态下外径 Dz(mm) 自由状态螺套圈数 N(≈) 1d 2 2.9 1.5d 3 4.7 2d 4 6.5 1d 2.5 3.5 1.5d 3.75 5.9 2d 5 8.1 1d 3 4 1.5d 4.5 6.3 2d 6 8.7 1d 4 3.7 1.5d 6 6 2d 8 8.4 1d 5 4.3 1.5d 7.5 6.9 2d 10 9.7 1d 6 4.2 1.5d 9 7 2d 12 9.6 1d 7 5.4 1.5d 10.5 8.5 2d 14 11.6 1d 8 6.1 1.5d 12 9.5 2d 16 13 1d 8 4.7 1.5d 12 7.4 2d 16 10.6 1d 10 7.6 1.5d 15 12 2d 20 16.3 1d 10 5 1.5d 15 8 2d 2