The torque limiter (also called a torque limiter, safety coupling, safety clutch), is a component connected with a driving machine and working machine, the main function for overload protection, torque limiter is when overloading or mechanical failure caused the required torque exceeds the set value, it takes the transmission slip limit of torque transmission system to restore the connection, when the overload situation disappears. This will prevent the mechanical damage, avoids the expensive downtime losses. The torque limiter using spring-loaded friction surface, with a nut or bolt to adjust the spring force, the sliding torque preset. According to the working principle can be divided into friction type torque limiter and a steel ball type torque limiter (ball type torque limiter), application scope: Electronic equipment, automated production lines, the conveyor industry etc.