Screw size charts are available at the websites of W. L. Fuller, Inc., Engineers Edge and Jamestown Distributors. All of these websites also offer additional information about choosing the right screws for a particular project.
Find a tire size diameter chart on sites such as Tire-Size-Conversion.com, TireRack.com, TyreSizeCalculator.com and GoodYear.com. CSGNetwork.com also features a conversion tool for translating tire size diameters from metric measurements into customary measurements.
As of 2015, several independently operated websites offer tire size charts and conversion charts that list tire diameter, including Tire-Size-Conversion.com, TireRack.com and Maxima.org. Many tire retailers provide tire size calculators and tire sizing guides, including BFGoodrichTires.com.
Find a chart of machine screw sizes on the Bolt Depot website. Click Fastener Info on the upper right side of the page, then scroll down and click Machine Screws under the Type-Specific Information heading. The site offers machine diameter and thread charts in U.S. and metric units.
To determine wood screw size, measure the thickness and width of the wood that the screw is entering and root diameter of the screw. Ensure that the size of the screw is such that there is enough wood material beyond and around the length and diameter of the screw.
There are different ways to find the diameter of a circle depending on what information you start with. If you know the circumference of the circle, divide the circumference by pi to find the diameter.
Headings on a thread pitch chart include thread class, the fit when a screw is being placed in an also-threaded part; major and minor diameter; and pitch diameter, the point where the width of thread and space between threads is equal. Screw dimensions vary based on the intended use.
CSGNetwork.com provides a metric chart for machine screw sizes and EngineersEdge.com offers a list of links to metric size charts for various types of screw and fastener sizes. In addition to a drill screw metric size chart, CSGNetwork.com offers a tap and clearance drill screw size chart.
If the radius of the circle is known, the diameter formula is diameter=2R, where R equals the circle's radius. If the circumference of the circle is known, the diameter is found using diameter=C/Pi, where C is the circumference and pi is approximately 3.142.
The Earth has a diameter of 7,926.3 miles at the equator, and its circumference, or the distance around the earth at the equator, is 24,901.55 miles. The Earth is widest at the equator.