All tables and charts should be considered as giving approximate equivalents, particularly when converting to a method or scale which is not physically possible for the test material and thus cannot be verified. An example would be converting HV/10 or HR-15N value on a thin coating to the HRC equivalent. The data in the following table is approximate.

Chemical composition for stainless steel by grades

Coefficients of friction µ total of stainless steel screws (according to VDI 2230 guideline)

Note: The following table is provided for guidance only as there are often dimensional variations between standards.)

According to VDI 2230 guidelines.

The International Protection Marking (IP Code), IEC standard 60529, classifies and rates the degree of protection provided against intrusion, dust, accidental contact, and water by mechanical casings and electrical enclosures. It is published by the International Electrotechnical Commission (IEC). The equivalent European standard is EN 60529.