bolt torque testing equipment High quality screw Bolt pull and torsion testing machine Main parameter： 1. Control system: 220 V ± 10V AC 50 ± 2Hz。 2. Axial force range: 10-500kn. 3. Torque range: 50 ~ 2000Nm. 4. Large hexagon bolt: M12 ~ M30. 5. Torsion shear bolt: M16 ～ M30. 6. Power supply: 380V loading system ± 10V AC …