一根直径为4.75英寸的重型电缆,使用重型卸扣和链节板连接至5英寸无钉链。
A 4.75 inch diameter heavy wireline connected to a 5 inch studless chain using heavy shackles and link plates.
皮带扣被赞同一个螺丝钉。
为了克服剪钉式和反扣式两种安全接头的不足,研制出一种滑套式井下安全接头。
To overcome the shortcomings of the shear pin type joint and left-hand thread type joint, a sliding sleeve subsurface safety joint is developed.
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