平封头 flat head

无支撑平封头和盖板 unstayed flat heads and covers

有孔圆形平封头 PIERCED CIRCULAR FLAT ENDS

焊接式平封头 welded flat head

螺栓连接式平封头 bolted flat head

没有拉撑的平封头 unsteady flat head

在平板封头上 in flat heads

折边平封头 flanging-only head

锻制平封头 forged flat head

平板封头 flat-plate closure ; circular flat heads