screw

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

AI overview

A screw is a fastener with a threaded shaft and a head that can be twisted into materials to hold things together. Screws are widely used in construction, manufacturing, and everyday applications because they provide a strong, adjustable connection that can be easily removed and reused.

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Wikidata facts

Image: Black wood screw with flat Phillips head.jpg

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Commons category: Screws
Commons gallery: Screw
exact match: wordnet-rdf.princeton.edu/wn31/104097355-n

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~38 min read

Article

25 sections

Contents

History
Manufacture
Types of screws
Shank
Wood screw
Self-tapping screw
Machine screw
Hex cap screw
Lag screw
Bone screw
Head
Sizes
Metric
Inch
Tools
Screw threads
ISO metric screw thread
Whitworth
British Association screw thread
Unified Thread Standard
See also
References
Citations
General and cited references
External links

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 screw is an externally helical threaded fastener capable of being tightened or released by a twisting force (torque) to the head. The most common use of screws is to hold objects together and there are many forms for a variety of materials. Screws might be inserted into holes in assembled parts or a screw may form its own thread. The difference between a screw and a bolt is that the latter is designed to be tightened or released by torquing a nut.