螺纹规格d×p | 安装后螺套的直径倍数k×d | 钢丝螺套安装后长度L(mm) | 钻头直径(底孔尺寸)do(mm) | 安装前的螺套孔径(mm) | 自由状态螺套 圈数N(≈) | M2×0.4 | 1D 1.5D 2D | 2 3 4 | 2.1 | 2.6-2.8 | 3.2 5.3 7.4 | M2.5×0.45 | 1D 1.5D 2D | 2.5 3.75 5 | 2.6 | 3.3-3.5 | 3.6 5.9 8.2 | M3×0.5 | 1D 1.5D 2D | 3 4.5 6 | 3.1 | 3.8-4.0 | 4.2 6.8 9.4 | M4×0.7 | 1D 1.5D 2D | 4 6 8 | 4.2 | 5.15-5.35 | 4 6.6 9.1 | M5×0.8 | 1D 1.5D 2D | 5 7.5 10 | 5.2 | 6.35-6.6 | 4.4 7.1 9.9 | M6×1 | 1D 1.5D 2D | 6 9 12 | 6.3 | 7.6-7.85 | 4.3 6.9 9.6 | M7×1 | 1D 1.5D 2D | 7 10.5 14 | 7.3 | 8.65-8.9 | 5.2 8.3 11.5 | M8×1.25 | 1D 1.5D 2D | 8 12 16 | 8.3 | 9.85-10.1 | 4.8 7.7 10.6 | M10×1.5 | 1D 1.5D 2D | 10 15 20 | 10.4 | 12.1-12.5 | 5 8.1 11.2 | M12×1.75 | 1D 1.5D 2D | 12 18 24 | 12.4 | 14.4-14.8 | 5.3 8.4 11.6 | M14×2 | 1D 1.5D 2D | 14 21 28 | 14.5 | 16.8-17.2 | 5.4 8.7 11.9 | M16×2 | 1D 1.5D 2D | 16 24 32 | 16.5 | 19.0-19.4 | 6.3 10 13.1 | M18×2.5 | 1D 1.5D 2D | 18 27 36 | 18.6 | 21.5-22.2 | 5.6 9.0 12.3 | M20×2.5 | 1D 1.5D 2D | 20 30 40 | 20.5 | 23.7-24.2 | 6.3 10 13.8 | M22×2.5 | 1D 1.5D 2D | 22 33 44 | 22.6 | 26.3-26.8 | 6.9 11 15 | M24×3 | 1D 1.5D 2D | 24 36 48 | 24.8 | 28.5-29.1 | 6.3 10 13.7 | |