Locksmith Glossary - G


Source: Lock Industry Standards and Training (LIST) Council

Gang Lock
(n.) A locking mechanism with multiple bolts which locks different openings simultaneously by a single action.

Garage Door Lock
(n.) A rim lock mechanism designed for use on an overhead door, which mechanism has a spring loaded bolt which automatically locks the door's bolt mechanism.

Gate
(n.) A notch cut into the edge of a tumbler to accept a fence or sidebar.

Geographical Exclusivity
(n.) A feature, offered by some manufacturers, of distributing keyways and/or combinations for locks to ensure uniqueness in a geographic location.

GGGMK
(abb.) Great Great Grand Master Key

GGGMK'D
(abb.) Great Great Grand Master Keyed

GGM
(abb.) Great Grand Master Key

GGMK
(abb.) Great Grand Master Key

GGMK'D
(abb.) Great Grand Master Keyed

Glass Relocker
(n.) A device employing a frangible plate intended to permanently incapacitate a security container's normal opening mechanism if activated by physical attack on the container.

GM
(abb.) Grand Master Key

GMK
(abb.) Grand Master Key

GMK Section
(abb.) Grand Master Key Section

GMK'D
(abb.) Grand Master Keyed

Graduated Drivers
(n.) A set of top pins of different lengths. Usage is based on the height of the rest of the pin stack, in order to achieve a uniform pin stack height.

Source: Lock Industry Standards and Training (LIST) Council

Grand Master Key
(n.) The key which operates two or more separate groups of locks, which are each operated by a different master key.

Grand Master Key System
(n.) A master key system which has exactly three levels of keying.

Grand Master Keyed
(adj.) Of or pertaining to a lock or cylinder which is or is to be keyed into a grand master key system.

Graphite Gun
(n.) A usually flexible container designed to dispense a powdered lubricant.

Gravity Pivot Hinge
(n.) A hinge with complimentary sloped or V shaped knuckles on each leaf that cause gravity to turn the door back to the closed position.

Great Grand Master Key
(n.) The key which operates two or more separate groups of locks which are each operated by a different grand master key.

Great Grand Master Key System
(n.) A master key system which has exactly four levels of keying.

Great Grand Master Keyed
(adj.) Of or pertaining to a lock or cylinder which is or is to be keyed into a great grand master key system.

Great Great Grand Master Key
(n.) The key which operates two or more separate groups of locks which are each operated by different great grand master keys.

Great Great Grand Master Key System
(n.) A master key system which has five or more levels of keying.

Great Great Grand Master Keyed
(adj.) Of or pertaining to a lock or cylinder which is or is to be keyed into a great great grand master key system.

Grip
(n.) The knob, lever, thumbpiece, push-pull operator, etc. of any working trim.

Group 1
(n.) A UL rating given to a mechanical combination lock able to withstand 20 man-hours of expert manipulation as well as other specifications listed in UL 768.

Group 1R
(n.) A UL rating given to a mechanical combination lock equal to a group 1 lock which has the added feature of being X-Ray resistant, and which meets other requirements listed in UL publication 768.

Group 2
(n.) A UL rating given to a mechanical combination lock able to withstand reasonable expert manipulation as well as other specifications listed in UL 768.

Group 2M
(n.) A UL rating given to a mechanical combination lock able to withstand 2 man-hours of expert manipulation as well as other specifications listed in UL 768.

GSA
(abb.) General Services Administration (US Government)

GSA Class 1
(n.) A GSA approved container meeting Federal Specification AA-F-357(canceled) with entry protection consisting of 10 Man-Minutes forced entry, 30 Man-Minutes surreptitious entry and 1 hour fire rating.

GSA Class 2
(n.) A GSA approved container meeting Federal Specification AA-F-357(canceled) with entry protection consisting of 5 Man-Minutes forced entry, 20 Man-Minutes surreptitious entry and 1 hour fire rating.

GSA Class 3
(n.) A GSA approved uninsulated container meeting Federal Specification AA-F-358 with entry protection consisting of 20 Man-Minutes surreptitious entry.

GSA Class 4
(n.) A GSA approved uninsulated container meeting Federal Specification AA-F-358 with entry protection consisting of 5 Man-Minutes forced entry, 20 Man-Minutes surreptitious entry.

GSA Class 5
(n.) A GSA approved uninsulated container meeting Federal Specification AA-F-358 with entry protection consisting of 10 Man-Minutes forced entry, 20 Man-Hours surreptitious entry and 30 Man-Minutes Covert entry.

GSA Class 6
(n.) A GSA approved uninsulated container meeting Federal Specification AA-F-358 with entry protection consisting of 20 Man-Hours surreptitious entry and 30 Man-Minutes covert entry.

GSA Class 7
(n.) A GSA approved uninsulated container meeting Federal Specification AA-F-2815(canceled) with entry protection consisting of 20 Man-Hours surreptitious entry and 15 Man-Minutes covert entry.

GSA Container
(n.) Any container approved by the General Services Administration for storage of classified material.

GSA Weapons Container
(n.) A GSA vault or map and plan container used to store weapons and requiring a minimum protection of a Group 1 lock.

Guard Bolt
(n.) A spring loaded bolt which, when activated, will deadlock a latch bolt.

Guard Filler
(n.) A spacer used in place of a lever in the guard lever pack of a safe deposit lock.

Guard Key
(n.) A key which must be used in conjunction with a renter's key to unlock a safe deposit lock. it is usually the same for every lock within an installation.

Guard Lever
(n.) Any lever tumbler, in a safe deposit lock, intended to be operated by the guard key.

Guard Post
(n.) 1. The circular member in a safe deposit lock upon which the guard levers are mounted.
(sic) 2. The trunnion for the guard key in a safe deposit lock.

Guard Tumbler
(n.) Any tumbler installed in a safe deposit lock for the guard key to activate.

Guest Key
(n.) A key in a hotel master key system which is normally used to unlock only the one guest room for which it was intended, but will not operate the lock in the shut out mode.

Guide
(n.) 1. That part of a key machine which follows the cuts of a pattern key or template during duplication.
(n.) 2. That part of a flat key lever lock which connects the nose to the foot and supports the key blade.

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