DQ140/25Y multi-purpose hydraulic power tongs are open-end power tongs used for making and unmaking 2 3/8″~3 1/2″ drill pipes, 2 3/8″~4 1/2″ tubings and 4 1/2″~5 1/2″ casings in oilfield workover operations. They are particularly suitable for deep well hard formation operations, with good clamping performance, high safety factor, and extremely convenient adjustment and maintenance.