ASTM A193 Grade B7 Heavy Hex Bolts

The ASTM A193 Grade B7 Heavy Hex Bolt is the most common high-strength bolt used in high-temperature and high-pressure service, particularly in flanged pipeline joints. It is manufactured from an Alloy Steel (Chromium-Molybdenum steel) and heat-treated to achieve exceptionally high tensile and yield strength. Its heavy hex pattern provides a larger bearing surface and an increased wrenching area compared to standard hex bolts, which is critical for inducing the high pre-load required in pressure piping. These bolts are specifically designed to be mated with ASTM A194 Grade 2H Heavy Hex Nuts. Zeron Fasteners manufactures B7 Heavy Hex Bolts to exact dimensional specifications (ASME B18.2.1), ensuring reliable and certified performance in environments up to 450°C (842°F).

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