head metal meaning in English

冒口
热冒钢
热帽钢

Metric screw hexagon head metal plugs with collar joints for use with gaskets
与垫片配用的带轴环接合件的公制螺纹六角头金属螺塞
Metric screw hexagon head metal plugs with collar joints for use with o . rings
与形密封垫圈配用的带轴环接合件的公制螺纹六角头金属螺塞
Metric screw hexagon socket cylindrical head metal plugs with collar joints for use with o - rings
与形环配用的公制螺纹内六角圆筒头轴环接合金属螺塞
Metric screw hexagon socket cylindrical head metal plugs with collar joints for use with gaskets
与垫片配用的带轴环接合件的公制螺纹内六角圆筒头金属螺塞