公制螺纹最小退刀槽标准
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M520.9632×0.7M620.8662×0.9M821.082×1.1M1021.2992×1.3M1221.522×1.6M1
公制螺纹最小退刀槽标准