Jackscrew
(n.) A threaded rod used for centering and balancing a vault door & frame in position during installation.
Source: Lock Industry Standards and Training (LIST) Council
Jamb, Jambe
(n.) 1. One of a pair of vertical posts or pieces that together form the sides of a door, window frame, or fireplace, for example.
(n.) 2. A projecting mass or columnar part.
Source: Dictionary.com
Jiggered Finish
(n.) A surface adorned with overlapping concentric circles.
Source: Lock Industry Standards and Training (LIST) Council
Jimmy Proof
(adj.) Pertaining to a lock having a bolt which interlocks with its strike.
Source: Lock Industry Standards and Training (LIST) Council
JIS
(abb.) Japanese Industrial Standard
Source: Lock Industry Standards and Training (LIST) Council
Jumbo Cylinder
(n.) A rim or mortise cylinder of 1-1/2" diameter.
Source: Lock Industry Standards and Training (LIST) Council
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