ASTM A320: “This specification covers alloy steel bolting materials and bolting components for pressure vessels, valves, flanges, and fittings for low-temperature service.”.Ferritic steels shall be properly heat treated as best suits the high-temperature characteristics of each grade.” ASTM A193: “This specification covers alloy steel and stainless steel bolting material for pressure vessels, valves, flanges, and fittings for high temperature or high-pressure service, or other special-purpose applications.They are governed by three main industry standards: Industrial fasteners can be called stud bolts or - of course - just plain ol’ bolts. Summary of Standards for Common Fasteners heavy hex nuts (2H nuts, or Grade 4 & 7 nuts)īut we’ll start with an overview of the standards governing the use of nuts and bolts in industrial applications.In this article, we’ll discuss several different relevant aspects of these fasteners, including: The names also indicate which will perform better in certain environments, such as high-temperature and high-pressure applications. At first glance, the names of fasteners used in bolting for ASME pressure vessels and piping can sound like something out of the old-school board game “ Battleship.”ī7, B8, 2H, A193.dangit, you just sunk my destroyer.Įach of these labels are meaningful, and can indicate the use of different materials (such as alloy steel or stainless steel) with different mechanical properties.
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