http://pastport.jp/user/mikehouke/timeline/17HS19-2004S1%20Nema%2017%20Stepper%20Motor%20Bipolar%2059Ncm%20%2884oz.in%29 This is an updated version nema 17 stepper motor with holding torque of 59Ncm(83.6oz.in). https://www.oyostepper.com/goods-50-Nema-17-Stepper-Motor-Bipolar-59Ncm-84ozin-2A-42x48mm-4-Wires-w-1m-Cable-Connector.html ja-JP