A screw with a recessed hex shaped head.


Related Terms

PIPE CUTTER

A hand tool consisting of a clamplike device with three cutting wheels which are forced inward by screw pressure to cut into a pipe as the tool is rotated around the pipe circumference.

PILOT HOLE

1. In metal-forming operations, a prepunched hole in a metal strip into which the pilot component of the die enters in order to assure precise registration of the strip at each work station. 2. A small hole drilled ahead of a larger borehole. 3. A hole drilled in a piece of wood to serve as a guide for a nail or a screw or for drilling a larger hole.

PHILLIPS SCREW

A screw having in its head a recess in the shape of a cross; it is inserted or removed with a Phillips screwdriver that automatically centers itself in the screw.

METERING SCREW

An extrusion-type screw feeder or conveyor section used to feed pulverized or doughy material at a constant rate.

MAJOR DIAMETER

The largest diameter of a screw thread, measured at the crest for an external (male) thread and at the root for an internal (female) thread.

LEVELING SCREW

An adjusting screw used to bring an instrument into level.

LEFT-HAND

Of drilling and cutting tools, screw threads, and other threaded devices, designed to rotate clockwise or cut to the left.

JIM CROW

A device with a heavy buttress screw thread used for bending rails by hand.

JACKSCREW

1. A jack operated by a screw mechanism. Also known as screw jack. 2. The screw of such a jack.

INTERRUPTED SCREW

A screw with longitudinal grooves cut into the thread, and which locks quickly when inserted into a similar mating part.

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