切削与挤压攻丝底孔尺寸对照表 螺纹 M1 M1.2 M1.4 M1.6 M1.7 M2 M2.3 M2.5 M2.6 M3 M3.5 M4 M5 M6 M7 M8 M10 螺距 0.25 0.25 0.3 0.35 0.35 0.4 0.4 0.45 0.45 0.5 0.6 0.7 0.8 1 1 1.25 1.5 切削攻牙 前底孔尺 0.85 1.02 1.19 1.36 1.45 1.6 1.96 2.13 2.21 2.5 2.98 3.3 4.2 5 5.95 6.8 8.5 公差 (+0,-0.03) (+0,-0.03) (+0,-0.03) (+0,-0.03) (+0,-0.03) (+0,-0.03) (+0,-0.03) (+0,-0.03) (+0,-0.03) (+0,-0.03) (+0,-0.03) (+0,-0.03) (+0,-0.03) (+0,-0.03) (+0,-0.03) (+0,-0.03) (+0,-0.03) 切削攻牙後 底孔尺寸 #REF! 1.03 1.2 1.38 1.46 #REF! 1.98 #REF! 2.24 #REF! #REF! #REF! #REF! #REF! #REF! #REF! #REF! 公差 (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) 挤压攻牙前 内孔尺寸 0.91 1.09 1.27 1.46 1.55 1.82 2.09 2.28 2.37 2.73 3.19 3.64 4.55 5.46 6.37 7.28 9.1 公差 (+0,-0.04) (+0,-0.04) (+0,-0.04) (+0,-0.04) (+0,-0.04) (+0,-0.04) (+0,-0.04) (+0,-0.04) (+0,-0.04) (+0,-0.04) (+0,-0.04) (+0,-0.04) (+0,-0.04) (+0,-0.04) (+0,-0.04) (+0,-0.04) (+0,-0.04) 預沖孔 0.5 0.6 0.7 0.8 0.85 1 1.15 1.25 1.3 1.5 1.75 2 2.5 3 3.5 4 5 公差 (+0.15,-0) (+0.15,-0) (+0.15,-0) (+0.15,-0) (+0.15,-0) (+0.15,-0) (+0.15,-0) (+0.15,-0) (+0.15,-0) (+0.15,-0) (+0.15,-0) (+0.15,-0) (+0.15,-0) (+0.15,-0) (+0.15,-0) (+0.15,-0) (+0.15,-0) 擠壓攻牙後 內孔尺寸 #REF! 1.06 1.23 1.41 1.5 #REF! 2.03 #REF! 2.29 #REF! #REF! #REF! #REF! #REF! #REF! #REF! #REF! 公差 (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) (+0,-0.05) 备注:切削攻牙前底孔尺寸=螺牙尺寸*0.85 ;挤压攻牙前底孔尺寸=螺牙尺寸*0.91 ; 预沖孔=螺牙尺寸*0.5; 切削攻牙后底孔尺寸=螺牙尺寸*0.86;挤压攻牙后内孔尺寸=螺牙尺寸*0.88 常用挤压丝攻攻牙底孔 螺牙尺寸 M2 M2.5 螺距 0.4 0.45 不锈钢 1.87 2.35 其他(Al、SECC、SGCC等) 1.82 2.275 公差 (+0,-0.03) (+0,-0.04) 攻牙后底孔 1.74 2.175 公差 (+0,-0.05) (+0,-0.05) M3 0.5 2.85 2.73 (+0,-0.05) 2.61 (+0,-0.05) 备注:不锈钢=螺牙尺寸*0.94; 其他=螺牙尺寸*0.92;攻牙后底孔=螺牙尺寸*0.87