ELK KDA030 crane motor 1.long life,preciously fabricated surface 2.low noise,smooth, ... (SNCM220&SCM415)with heat treatment of vacuum and carbonnitriding. The shaft is manufactured by alignment and grinding,which makes it high ... , which makes goods not shaking.3.MotorHigh performance,high torque,motor itself ensures quick heat dissipation, and resistance to high voltage ...