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The '''Society of Automotive Engineers (SAE)''' has a standard called SAE J429 Mechanical And Material Requirements for Mechanical Fasteners. The standard introduces a designation system based on numbers where increasing numbers indicate increasing tensile strength. Another organization, ASTM International, formerly known as '''American Society for Testing and Materials''', is an international standards organization that develops and publishes voluntary consensus technical standards. ASTM fastener standards specify and test the properties of mechanical fasteners such as bolts, nuts, screws, and other hardware fasteners. The SAE steel grades system is a standard alloy numbering systems for steel grades maintained by SAE International. In the 1930s and 1940s the American Iron and Steel Institute (AISI) and SAE were both involved in efforts to standardize such a numbering system for steels. In 1995 the AISI turned over future maintenance of the system to SAE for reasons including redundancy. The '''Society of Automotive Engineers (SAE)''' has a standard called SAE J429 Mechanical And Material Requirements for Mechanical Fasteners. The standard introduces a designation system based on numbers where increasing numbers indicate increasing tensile strength. Another organization, ASTM International, formerly known as '''American Society for Testing and Materials''', is an international standards organization that develops and publishes voluntary consensus technical standards. ASTM fastener standards specify and test the properties of mechanical fasteners such as bolts, nuts, screws, and other hardware fasteners. The SAE steel grades system is a standard alloy numbering systems for steel grades maintained by SAE International. In the 1930s and 1940s the American Iron and Steel Institute (AISI) and SAE were both involved in efforts to standardize such a numbering system for steels. In 1995 the AISI turned over future maintenance of the system to SAE for reasons including elimination of redundancy.