cap screw

noun

1. 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.

cap screw

noun

1. a screwed bolt with a cylindrical head having a hexagonal recess. The bolt is turned using a wrench of hexagonal cross section

Word History and Origins

Origin of cap screw¹

First recorded in 1880–85

Example Sentences

Snap a ridged clamp around the neck of the bottle, then a cap screws onto it, preserving the wine’s fizz and sparkle for several days.

From Washington Post

When the heads of cap screws are finished they are designated as “milled heads.”

From Project Gutenberg

When replacing the wheel, place the handle of the wrench through the lower cap screw hole, lift up on the wrench so that the wheel will clear the ground and push in place.

From Project Gutenberg

Then the two are held firmly together with the left hand until the cap screw is turned tight.

From Project Gutenberg

The cap screws were made from steel pump rods.

From Project Gutenberg