See https://www.boltdepot.com/fastener-information/materials-and-grades/bolt-grade-chart.aspx for more information on these marking schemes.
== References ==
*http://www.timco.co.uk/screw-types
*http://store.curiousinventor.com/guides/Metal_Working/Screws
*https://en.wikipedia.org/wiki/Screw
*Unbrako Engineering Guide"
*Fundamentals of Machine Component Design," by Robert C. Juvinall, Kurt M. Marchek
*The Machinery's Handbook, 27th ed.
*"Handbook of Bolts and Bolted Joints," by John Herbert Bickford, Sayed Nassar
*"What Every Engineer Should Know About Threaded Fasteners: Materials and Design," by Alexander Blake
*http://esmat.esa.int/ecss-q-st-70-46c.pdf
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== References ==