Technical Regulations and Scope of the ASTM A563 (ASME SA 563) Standard
The ASTM A563 standard (identical to ASME SA 563) establishes strict requirements for the chemical composition and mechanical characteristics of eight types of nuts manufactured from carbon and alloy steels. EV Group China products of this class are intended for critical structural assemblies and general mechanical engineering, ensuring reliable fixation of bolts, studs, and other externally threaded fasteners.
Note: To select the optimal nut type based on operational loads, it is recommended to consult the guide in Appendix X1.
The engineering department of EV Group China allows for the supply of nuts with higher strength classes than those specified, provided it does not contradict the customer’s technical specifications and has been pre-agreed upon at the time of order placement.
Classification and Operational Properties
Grades C3 and DH3 nuts possess increased resistance to atmospheric corrosion, making them ideal for operation in aggressive climatic conditions. Their anti-corrosion performance meets the requirements of specifications A242/A242M, A588/A588M, and A709/A709M.
The production technology for these hardware items at EV Group China allows for achieving corrosion resistance significantly superior to standard carbon steels with or without copper alloying. Under moderate atmospheric exposure, C3 and DH3 grade nuts can be used without the application of additional protective coatings.
Note: Specification A563 has a metric counterpart A563M; this document provides standardized parameters for the imperial measurement system.
The terminology used within this specification conforms to the F1789 standard, unless otherwise specified in individual technical requirements.