SAE International, the global association of engineers and technical experts dedicated to advancing mobility knowledge and standards development, has announced the publication of SAE J3400/2™, a new standard defining the mechanical interface of EV connectorsand inlets for the North American Charging System (NACS). This release marks a significant step forward in ensuring the safe, reliable, and interoperable deployment of electric vehicle (EV) charging infrastructure at scale.
The SAE J3400/2 North American standard from SAE International defines the physical design of NACS connectors and inlets for high-voltage EV charging.
SAE J3400/2 provides detailed specifications for the physical architecture of the NACS coupler. The standard includes comprehensive 2D technical drawings and 3D modeling files, enabling automotive OEMs and infrastructure providers to accelerate the deployment of compatible hardware. By codifying mechanical details such as geometry, dimensions, and material interfaces, J3400/2 facilitates robust and repeatable design, supporting high-voltage applications, including 1000-volt bidirectional power transfer.
The new standard complements the broader J3400 series. SAE J3400 outlines the general requirements for NACS, encompassing AC and DC power transfer, communication protocols, cybersecurity, and V2X functionality. SAE J3400/1 defines the safety and performance criteria for EV charging adapters and designates OEM-qualified devices. Together, these documents provide a comprehensive foundation for the next generation of electric vehicle (EV) charging systems.
According to Dr. Rodney McGee, Ph.D., P.E., chairman of the SAE J3400 NACS Task Force and Research Engineer at the Transportation Electrification Center at the University of Delaware, “The publication of SAE J3400/2 as an SAE International standard represents our confidence in the maturity of the 1000-volt-capable NACS coupler for reliable and safe bidirectional power transfer.”
Christian Thiele, Senior Director of Global Ground Vehicle Standards at SAE International, added, “By standardizing these mechanical details, J3400/2 allows manufacturers to design and deploy EV charging infrastructure more rapidly. This is a critical step forward in supporting widespread EV adoption.”
For more information or to access the full specification, visit SAE J3400/2 Standard.
About SAE International
SAE International is a global organization dedicated to advancing mobility knowledge and solutions for the benefit of humanity. With nearly 200,000 engineers, technical experts, and volunteers worldwide, SAE develops international standards, fosters engineering innovation, and supports STEM education through its philanthropic SAE Foundation. Learn more at www.sae.org.
Source: SAE International. Photo: Components Source, LLC Industry Stock Photo
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