The front two-jaw-plates of the master tong are in the swing structure and the back jaw plate is the roller-climbing structure. The assembly and disassembly is very convenient. The optimum tangent-diameter ratio design ensures reliable clamping and easy slope retreating. The back tong is the three-jaw-plate structure pushed by hydraulic cylinder. The structure is simple and the clamping is reliable;
Four-gear rotation is adopted for large speed regulation range. And the rated torque is large;
It has the braking mode with braking staple. The braking torque is large. The operation is simple. And it is convenient for repair and replacement;
With the open large gear supporting structure, hardness and rigidity of open large gear is enhanced considerably;
The shell is made of steel plate with high hardness. The overall hardness is good. Various jaw plates are made with fine casting and forging process. It has beautiful appearance and high hardness;
Hydraulic torque indicator is provided. And installation interface of turning torque instrument is provided for computerized management.