Profile: Woodwood (Door Controls) Ltd. provides Macwood door control products, including under floor door operators, overhead door operators and automatic door locking systems. Macwood PSB automatic locking bolts are the pneumatic equivalent of an electrical solenoid bolt. Our PSB locking bolts will have a minimum force of 50N to retract the bolt in the event of an air failure, in normal operation this will be in excess of 200N. All bolts are operated by spring and air pressure. The PSB range includes units designed to lock doors with rails (pin bolt) and to lock glass doors without a bottom rail (fork bolt suitable for less-secure access control doors). Units are available to suit single or pairs of doors.