interrupted-screw

interrupted screw

noun
a screw having the thread interrupted in one or more places by longitudinal channels, as in the breech of a cannon or the lead screw of a lathe.
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World English Dictionary
interrupted screw
 
n
a screw with a slot or slots cut into the thread, esp one used in the breech of some guns permitting both engagement and release of the block by a partial turn of the screw

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