挤压螺纹底孔

挤压螺纹底孔推荐值及算法螺纹代号牙型高度（％）10095908580757065底孔直径M2×0.41.771.781.81.811.821.831.841.85M2.5×0.452.252.262.272.282.32.312.322.33M3×0.352.82.812.822.832.842.852.862.87M3×0.52.722.732.752.762.772.792.82.82M4×0.53.723.733.753.763.773.793.83.82M4×0.73.63.623.643.663.683.73.723.74M5×0.54.724.734.754.764.774.794.84.82M5×0.84.554.574.594.614.644.664.684.7M6×0.755.575.595.625.645.665.685.75.72M6×15.435.465.495.525.555.575.65.63M8x0.757.577.607.637.667.697.727.757.78M8×17.437.467.497.527.557.577.67.63M8×1.257.297.337.367.397.437.477.57.54M10×0.759.579.599.629.649.669.689.79.72M10×19.439.469.499.529.559.579.69.63M10×1.259.299.339.369.49.439.479.59.54M10×1.59.159.199.239.289.329.369.49.45M12×111.4311.4611.4911.5211.5511.5711.611.63M12×1.2511.2911.3311.3611.411.4311.4711.511.54M12×1.511.1511.1911.2311.2811.3211.3611.411.45M12×1.7511.0111.0611.1111.1611.211.2511.311.35挤压丝锥底孔粗略计算应该是：工程直径-0.5螺距。例如M12*1.0底孔直径=12-0.5×1=11.5软的材料适当减小底孔，硬的材料适当增大底孔预制孔尺寸=螺纹大径-0.53*螺距；当攻件是不锈钢等有色金属，预制孔尺寸=螺纹大径-0.43*螺距