... able to produce API and oilfield tq power tong, zq power tong, xyq power tong, casing power tong, drill pipe power tong ... quick make-up /break-out in well service operations. *Casing Power Tongs are widely used for pipes or casings diameters of 4 ... /2"~3 1/2", Model ZQ127, ZQ203 Technical parameter of TQ Casing power tong Model TQ178-16 TQ340-20A TQ340-35 TQ178 ...