... ,Now we offer tower cranes with maximum lifting loads form 2.5t to 16t, which include QTG25, QTZ25, QTZ31.5, QTZ40, QTZ63, ... we've got great praise from our clients.QTZ31.5,25 Series Tower Crane model QTZ4206 Maximum rated torque(KN·m)315 Maximum ... (m/min)53/26.5/6.7 Swiveling speed(r/min)0.38/0.7 Climbing speed(m/min)0. ... 4 Dead load(t)29.6/18.3 Upper chord of lifting beamφ76×4.5 ...