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shear line

   Also found in: Wikipedia 0.01 sec.
shear line [′shir ‚līn]
(meteorology)
A line or narrow zone across which there is an abrupt change in the horizontal wind component parallel to this line; a line of maximum horizontal wind shear.
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When a burglar tries to bump the lock, the bump key cannot bump the shorter pin stack so that the key pins and driver pins will not line up correctly to the shear line and the lock will not open.
Prevent Lock Bumping by John Davenport / Consumer news, advice, product reviews community
The standard states: "This process makes it more susceptible to picking through shear line manipulation, and by increasing the number of keys which operate it.
Keying systems by Doors and Hardware
Lock bumping, a decades-old technique that has gained recent notoriety in the media, uses a specially cut key and a tool to apply a burst of force, causing the pins inside the lock cylinder to separate across the shear line just long enough to allow the cylinder to turn.
Bump-proof your community by Arnold, Rachel / Units
 
 
 
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