ZK-150 TOP DRIVE ZK-150 Specifications Max Torque @ 5000 PSI12,000 FT-LBS Max Speed @ 2250 Engine RPM143 RPM Max Rotating Load Rating150 TONS Max Circulating Pressure10,000 PSI Gooseneck Connection3” 1502 Fluid Passage Bore Thru Stem2-7/16" I.D. Standard Stem Connection4" IF Weight, Approximately15,000 LBS The New ZK-150 Top Drive