... of large clamping range, high strength, steady tighten, no slipping.damage for pipe and clamping scar Structure and features Model BHJX ... of large clamping range, high strength, steady tighten, no slipping, no damage for pipe and clamping scar according to API standard. The ... teeth and jaw plate of the driving and backup clamps for different pipe diameters. It adopts siemens PLC+industry computer ...