How They’re Determined by the SAE, and How They’re Identified by Markings on the Fastener Head Automotive bolted joints operate under demanding cyclic loads, high temperatures, and increasingly lightweight designs. As a result, understanding bolt grades – and the standards behind them-is essential for fastener engineers working in OEM, Tier
When specifying fasteners for engineering projects, understanding the differences between ASTM, ISO, SAE, and JIS standards is critical. These four organizations govern the majority of fastener specifications used worldwide, but each has distinct origins, measurement systems, applications, and grading methods. Here’s what engineers need to know to navigate these standards
