"A standard is a document that provides requirements, specifications, guidelines or characteristics that can be used consistently to ensure that materials, products, processes and services are fit for their purpose."
These are the professional organizations developing standards for mechanical engineering:
Engineering standards describe the important features of a product, service or system. There is a current set of the Annual Book of ASTM Standards in the reference room [Ref. TA 401.A653].
An engineering code contains a collection of rules or regulations which provide correct procedures to maintain uniformity and safety.
Search for standards at the following web sites: