... contact(NC.COM) electric drop bolt lock for automatic door Fail Safe electric drop bolt lock for automatic doorVoltage: ... Bolt: polishing housing, 800Kg Holding Force Suitable For: Woodeng Door,Glass Door,Metal DoorSurface Temp: Low TemperatureAutolock Time Delay: 0,3 ... ,6,9sec.Signal Output: Door status Output,NC/COMInduction Distance: 8mmOperating temp: -10~+55 ...