退刀槽标准公制螺纹最小退刀槽标准螺纹尺寸退刀槽宽度B≥退刀槽深度h≥建议标注M520.9632×0.7M620.8662×0.9M821.082×1.1M1021.2992×1.3M1221.522×1.6M142.51.7322.5×2M162.51.7322.5×2M1832.1653×2.2M2032.1653×2.2M2232.1653×2.2M243.52.5983.5×2.6M273.52.5983.5×2.6M303.53.033.5×3.1M3343.034×3.2M3643.4644×3.5M3943.46...