Glossary Terms - P

Parallel Arm

A push side mounted system where the arm is parallel to the door when in the closed position.


To manipulate tumblers in a keyed lock mechanism through the keyway, without obvious damage, by means other than the specifically designed key.

Pin Tumblers (Cylinder)

Small pins within a lock cylinder which move up and down, forced toward the cylinder plug by springs and raised to their proper alignment to achieve a Shear Line by a key being inserted into the cylinder which has the correct combination of bitting cuts.


A hinging device used to install (hang) a door leaf. The pivot uses a fixed pin and a single joint pin receiver, both attached to their respective door leaf and frame jamb usually by a means of lateral fastening.


(of a lock cylinder) – The round part containing the keyway and rotated by the key to transmit motion to the bolt or other locking mechanism.

Plug Only to Show

(CONCEALED SHELL) – A cylinder whose head is cut back to fit under “plug only to show” escutcheon trim for enhanced security and appearance; also called concealed shell.

Pocket Door

A door carried on an overhead track that slides into a pocket inside a wall.

Pocket Hinge

A heavy, cast hinge designed to swing a door into a pocket at a right angel with the face of the opening. It is used where swing clear hinges are aesthetically unacceptable and the full width of corridor is required.They may also be used where the door leaf is shared by two (2) frame openings, as in locked-open corridors in detention facilities.

Power over Ethernet

A technology that uses standard LAN infrastructure to deliver power to network devices over the same cable used for network data connection.

Power Supply

Filtered and regulated. A device that supplies electrical current to an access control system. The current is filtered of “Electrical Noise”and regulates output.

Pressure Relief Backcheck Intensity Valve

A valve that reduces internal pressure when the closer is subjected to forceful opening. Helps extendcloser life.

Proximity Card

Low frequency, low security 125 kHz contactless RFID cards (legacy technology); often referred to as Prox cards.