ZK-250 TOP DRIVE ZK-250 Specifications Max Torque35,000 FT-LBS Max Speed136 RPM Max Rotating Load Rating250 TONS Max Circulating Pressure10,000 PSI Gooseneck Connection3” 1502 Fluid Passage Bore Thru Stem2-3/4 I.D. Standard Stem Connection4-1/2" IF Weight16,800 LBS