Additionally, the opening device must be easy for anyone to operate - usually a lever or push bar. This must be placed at the proper height. Most codes require a 32-inch clear opening, but some allow anything mounted above 34 inches to extend 4 inches into the width of the opening. Hinges support the weight of the door in use. Doors equipped with closers should have antifriction bearing hinges for smooth operation.
Bolts are part of the door's locking capacity, though they are independent of the lock mechanism.
The bolt protrudes from the lock and holds it to the strike. The cylinder contains the springs and tumblers that allow the keys to operate. Exit devices are latches released by pressing some type of touch bar. Closers control the door movement throughout its opening and closing swing. Accessories are items added to the door, such as weatherstripping.