Mechanical stop,steel torsion bar to maintain synchronization,high precision. 
 PC3900YR plate rolling machine is Motorized-adjusting device of backgauge and ram's stroke,fine adjusting by handwheel,numerical display. 
 Deflection compensation unit installed on the top die.Manual crowned bottom die holder is adopted for the machine above 250 tons. 
 Travel limit protection.Full machine guarding with safety interlocker.