Product Features 1. Steel plates welded as machine body, treated to remove internal stress, marked with high rigidity; 2. Crankshaft longitudinally arranged, compact structure and beautiful outlook; 3. Hexagonal guide rails of extra length, guide in high precision; 4. Combined-type pneumatic friction clutch-brake, steady engagement, low noise level; 5. Hydraulic overload protection device for JH21 and rigid protection device for JF21 to prevent damage of the machine tools due to overload; 6. PLC-controlled electric circuit, safety duplex valve for air pipelines, flexible and highly sensitive in movement,safe and reliable, single time, inching and continuous operations for options, conforming to the safety standard for stamping machines