擠壓螺紋常用底孔尺寸

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1、1、擠壓絲攻的鉆孔底徑一般等于公稱直徑－螺距×0.5。還要根據(jù)不同的材料、不同的螺紋精度來看。黃銅的孔徑可小幾絲，鋼材的孔徑要大一些。如以下的公制擠壓絲攻鉆孔直徑表G7－G8精度等級基本就是按這計算方法得來的??????????????????????????????????????公制擠壓絲攻鉆孔徑規(guī)格精度等級G4-G6G7-G8G9M1.0×0.250.860.88－M1.1×0.250.960.98－M1.2×0.251.061.08－M1.4×0.31.241.25－M1.6×0.351.411.43－M1.7×0.351.511.53－M1.8×0.3

2、51.611.63－M2.0×0.41.781.80－M2.2×0.451.951.98－M2.3×0.42.082.10－M2.5×0.452.252.28－M2.6×0.452.352.38－M3.0×0.52.732.75－M3.5×0.63.173.20－M4.0×0.73.623.653.69M5.0×0.84.564.604.64M6.0×1.05.455.505.55M7.0×1.06.456.506.55M8.0×1.257.317.387.44M10×1.59.189.259.32M10×1.259.319.389.44M12×1.7511.0

3、411.1211.21M12×1.2511.3111.3811.442、公制一般粗螺紋的底孔孔徑可按下式計算：當tL≤1時，?。篸Z=d-tL，當tL>1時，取：dZ=d-(1.04～1.06)tL式中：tL—螺距，mmdz—螺紋底孔直徑，mmd—螺紋直徑，mm一般情況下，螺紋底孔直徑選用如下(mm)：螺紋直徑d螺距tL底孔直徑dzM1M2M3M4M5M6M8M10M12M14M16M18M20M22M24M27M300.250.40.50.70.811.251.51.75222.52.52.5333.5?0.751.62.53.34.256.78.510.21

4、1.913.915.417.419.420.923.926.3