A193 is an ASTM International standard for high-strength alloy and stainless steel bolts and studs, typically used in high-pressure or high-temperature applications such as pipelines and pressure vessels. it writted by The Association of Standards & Materials.
The Association of Standards & Materials is a governance body in USA that provides specifications for a wide range of materials and fastener types. They also define the policy that obtains and certifies externally threaded fasteners based on certain criteria.
