Screws

thumb|An assortment of screws, and a Quarter (United States coin)|US quarter for size comparison thumb|upright|A wood screw: a) head; b) non-threaded shank; c) threaded shank; d) tip

A screwdriver is a tool, manual or powered, used for turning screws.

machine used for transferring water from a low-lying body of water into irrigation ditches

small metal rods used as fasteners having a head and often helical threading and being usually secured by a nut or by riveting

tool for screws with an internal hex head.

thumb|A security Torx L-key and fastener with holes for a safety pin to hinder disassembly with an ordinary Torx key. thumb|A Torx T8 screw head on a hard disk drive.

hardware threading standard

low friction linear actuator

a screw that can tap its own hole as it is driven into the material

technical standard for screw thread design

in mechanical engineering, looseness due to clearance between components

thumb|right|Three types of screw thread used in leadscrews: 3 & 4: [[buttress thread 5: round thread 6: square thread ]] thumb|DVD drive with leadscrew and stepper motor thumb|Floppy disc drive with leadscrew and stepper motor

mechanical device typically used in the breech of artillery guns

American businessman (1889–1958)

Trapezoidal thread forms

type of pump construction

Wikipedia list article

standard for screw threads in North America, whose characteristic dimensions are based on inch fractions

screw designed for a wood or a similar material, with a point, a relatively coarse thread, a thick shank, and, usually, an unthreaded portion of the shank at the head end

adhesive applied to screw threads to prevent unwanted loosening

The Stahlpanzerrohrgewinde (, "steel conduit thread") standard for screw threads, more often called by the shortened Panzergewinde (), was a technical standard created in Germany and subsequently used in Switzerland, Austria, and other neighboring European countries. It has been retracted. The thread is used to join pieces of electrical conduit and cable glands.

five-pointed tamper-resistant screw drive

tool for removing broken or seized screws

square-shaped screw drive

thumb|A 2.5-ton screw jack. The jack is operated by inserting the bar (visible lower left) in the holes at the top and turning. A jackscrew, or screw jack, is a type of jack that is operated by turning a leadscrew. It is commonly used to lift moderate and heavy weights, such as vehicles; to raise and lower the horizontal stabilizers of aircraft; and as adjustable supports for heavy loads, such as the foundations of houses.

type of screw that has threads through the whole of its length

screwdriver designed to limit tightening to a specified torque

type of screw

Asymmetric thread profile which allows for low friction and the ability to handle greater loads in one direction, at the cost of higher friction and inferior load bearing in the opposite direction