Information about Screws

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About Screws

Screws are spiral grooved fasteners that are driven into place via a rotating motion. There are a variety of screw types including a stainless steel screw, lead screw, captive screw, set screw, self drilling screw, sheet metal screw, lag screw, brass screw, and concrete screw. There are many systems for specifying the dimensions of screws. The United States has its own system of non-metric screws called the unified threat standard, but in much of the world the metric screw has displaced many older systems. Common metric screw measurements include an M3 thread that has a 0.5 mm pitch, M4: 0.7 mm, M6: 1 mm, M10-12: 1.5 mm, M14-16: 2 mm, M18-22: 2.5 mm. The primary purpose of screws is to act as a threaded fastener used to hold objects together. Screws are also used as a simple machine to translate torque into linear force.

Products & Services Related to Screws

Bolts

Bolts are threaded rods or pins that fasten objects together. They usually have a head at one end and a thread at the other. Bolts are secured by threaded nuts, and are available in both metric and non-metric designations.

Captive Screws

Captive screws are fasteners which remain attached to a panel or parent material, even after they are disengaged from the mating panel or part. They meld with the parent via cold forming, and then fuse with the panel or part into a single entity.

Engineering Web: Screws - Machine Design

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A Critical Look at Acme, Ball, and Roller Screws for Linear... A Critical Look at Acme, Ball, and Roller Screws for Linear Motion
Captive Screws \| Machine Design requirements, prevent screws from being lost, speed assembly and disassembly operations, and prevent damage from loose screws falling into moving
Standard Tapping Screws \| Machine Design Standard Tapping Screws November 15, 2002 The basic tapping screws are classified as thread forming and thread cutting.

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