挤压螺纹的底孔孔径如何计算

1、挤压螺纹的底孔孔径如何计算？挤压丝攻的钻孔底径一般等于公称直径-螺距X 0.5。还要根据不同的材料、不同的螺纹精度来 看。黄铜、铝合金等较软材料的孔径可小几丝，钢材等较硬材料的孔径要大一些。如以下的公制 挤压丝攻钻孔直径表 G7- G8精度等级基本就是按这计算方法得来的。公制挤压丝攻钻孔径规格精度等级G4-G6G7-G8G9M1.0 X0.250.860.88-M1.1 X0.250.960.98-M1.2 X0.251.061.08一M1.4 X0.31.241.25一M1.6 X0.351.411.43一M1.7 X0.351.511.53一M1.8 X0.351.611.63一M2.0

2、X0.41.781.80一M2.2 X0.451.951.98一M2.3 X0.42.082.10-M2.5 X0.452.252.28-M2.6 X0.452.352.38一M3.0 X0.52.732.75-M3.5 X0.63.173.20一M4.0 X0.73.623.653.69M5.0 X0.84.564.604.64M6.0 X 1.05.455.505.55M7.0 X 1.06.456.506.55M8.0 X 1.257.317.387.44M10X 1.59.189.259.32M10X 1.259.319.389.44M12X 1.7511.0411.1211.21M1

3、2X 1.2511.3111.3811.44螺纹公称尺寸MXP推荐 钻头直径 D小径最大直径1.601.571.681.751.711.84M 2.5 X 0.452.102.012.14M 3 X0.52.502.462.60M 4 X0.73.303.243.42M 5 X0.84.204 134.33M 615.004.925.156.005.926.15M 8 X1.256.806.656.91M 8 X17.006.927.15M101.58.508.388.68*18.808.658.91M10 X19.008.929.15Y推荐钻头直径为原JIS渤内螺纹用O(2推荐钻头直径请根据

4、钻头材质、形状以及工件材料,选择合适的直径。螺纹公林尺寸MXP推荐最小直径最大直径M12X1.7510.3010.1110.4410.5010.3810.68M12X1.2510.8010.6510.91M14X212.0011.8412.21M14X1.512.5012.3812.68M16X214.0013.8414.21M16X1.514.5014.3814.68/ 1_15.5015.2915.74M18X1.516.5016.3816.68M20 X2.517.5017.2917.7419.0018.9219.15公制螺纹使用挤压丝锥町:螺纹公称尺寸MXP推荐 钻头直径 D最小宜径最

5、大直径M 2 - 0.41.831.811.852.001.982.03M 2.5X0.452.302.282.33M 3 - 0.52.782.762.813.683.653.70M 5 X0.84.634.594.665.535.485.57M 7 X16.536.486.57M 8 X1.257.397.347.41M 8 X17.537.487.57M10 X1.59.249.189.28M10 X1.259.399.349.41M10 X19.539.489.57螺纹公林尺寸MXP推荐 钻头直径 D最小直径最大直径M12X1.7511.1211.0511.15I.1 伫 1.511.2411.1811.28M12X1.2511 3911.3411.41M14X213.0012.9213.04M14X1.513.2713.2113.30M16X215.0014.9215.04M16X1.515.2715.2115.