cap screw

a fastener for machine parts, threaded along the whole length of its shank and held by threads tapped in the hole in which it is screwed.

1880–85 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cap screw
a screwed bolt with a cylindrical head having a hexagonal recess. The bolt is turned using a wrench of hexagonal cross section

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The top left cap screw was found broken flush with the machined surface of the switch valve.
The clapper disc and the clapper hinge arm, including the clapper disc cap screw, shall be bronze or cast iron.
Some of the automatic slack adjusters had insufficient torque applied to the guide pawl cap screw.
Watertight valve chamber covers shall be fastened to the frame by counter-sunk stainless steel hexagonal-head cap screw.
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