Dictionary
machine' bolt"
a threaded fastener, used with a nut for connecting metal parts, having a thread diameter of about ¼ in. (6.4 mm) or more and a square or hexagonal head for tightening by a wrench. Cf.
cap screw, machine screw, stove bolt. See illus. under
bolt 1.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.