Bolt and Nut standard covert table

Bolts and nuts are manufactured according to different standards. some of these standards are Metric having millimeter as basic length standard and some of them have inch as their basic length standard. Therefore, finding equivalent standard from one system to another does not necessarily mean exact equal standard with precise mechanical, dimensional or chemical properties.

Currently, the majority of manufacturing standards are Metric. However, ASTM standard that is one of the most practical standards for manufacturing bolts and nuts is still defined using inch as its primary length dimension. following are the most common standards used for manufacturing bolt and nut. Please note that ASTM standard is only brought within the content of the table to illustrate physical resemblance of this standard to the others and since this standard is not Metric like the others it has different mechanical properties.

• DIN Deutsches Institut für Normung- German manufacturing standard
• ISO International Standards Organization
• ASME American Society of Mechanical Engineers
• ANSI American National Standards Institute
• EN European Standard
• ASTM American Society for Testing and Materials