drill rod coupling 钻杆接箍

control rod coupling socket 控制棒联接套筒

channel rod coupling 槽铁接头

male rod coupling tap 钻杆接头公锥

coupling rod 连接杆 ; 联接杆 ; 联结杆

rod reducing coupling 抽油杆异径接头

telescopic coupling rod 可伸缩的连接杆

rod end coupling 活塞杆端连接件

coupling rod pin 联轴杆轴销