A screw is a type of fastener, in some ways similar to a bolt (see Differentiation between bolt and screw below), typically made of metal, and characterized by a helical ridge, known as a male thread (external thread). Screws are used to fasten materials by digging in and wedging into a material when turned, Optional Shaft Codes Screw Stops and Boots. Screw stops are optional on machine screw jacks. When specified, the closed height of the jack and/or the protection tube length may be increased. Learn how to order metric screws, bolts machine screws with our Metric to SAE/SAE to Metric conversion information thread pitch charts.
ASM lists screw sizes for a variety of socket cap screws including fillet dimensions, nominal screw sizes, head body diameter, socket size , head height more. UNC and UNF - Unified Inch Screw Threads ANSI/ASME B1.1 Unified National Thread - UNC Coarse series and UNF Fine series British Standard Whitworth (BSW) is an imperial-unit-based screw thread standard .
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Metric bolt torque specificatioon chart for machine repair service. Approximate bolt tightening specs to be used as reference material if manufacturers bolt torque heremendations are not attainable.