rod clamp meaning in English

抽油杆夹持器
钻杆夹板
钻杆夹持器
钻杆夹头

Effects of polished rod clamps on polished rod fatigue life
光杆卡对光杆疲劳寿命的影响
The extensive range of optional equipment includes hydraulically operated drill rod clamps , rotary casing drives and casing oscillators
更大的直径可选装钻杆夹持器,套管驱动器和摇管器
The generously designed drill rod clamping device can be opened up fully to enable the installation of drilling tools and drill casings exceeding 171 / 2 " ( 444 mm ) in diameter
如图所示的钻杆夹持装置可安装最大直径为444毫米的钻具和套管