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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.