Definition of machine screw . : a screw with slotted head or socket head used for holding metal parts together. machine screw . a threaded fastener, either used with a nut or driven into a tapped hole, usually having a diameter of about 1/4 inch (6.4 mm) or less and a slotted head for tightening by a screw driver. Compare cap screw , machine bolt. machine screw - a screw used either with a nut or with a tapped hole; slotted head can be driven by a screw driver. screw - a fastener with a tapered threaded shank and a slotted head.

Examples: screw in a Sentence. 1 a : a simple machine of the inclined plane type consisting of a spirally grooved solid cylinder and a correspondingly grooved hollow cylinder into which it fits. Machine screw definition : a fastening screw with a machine -cut thread throughout the length of its shank Meaning, pronunciation, translations and examples Although machine screws are generally considered to be smaller than bolts, machine screws also tend to be designated as such if the primary tightening of the fastened joint hereplished by turning the head of the screw .