Stainless Steel Heavy Head Hex Bolts meeting the ASTM A193 Grade B8 Class 1. The A193 B8 specification covers the requirements for carbide solution treated 304 stainless steel bolting material specified for use in high temperature or high-pressure service and other special purpose applications. It is a fastener material specification defining typical chemical composition, mechanical properties, hardness requirement, preferential heat treatment, product marking, certification, and other requirements, suitable for bolting used in pressure vessel service, valves, flanges and fittings.

A193 B8 Heavy Hex Bolts have a wider head than that of a standard hex bolt. The larger hex head features an integral washer face under the head for a smooth bearing surface and allows the clamping load to be more evenly distributed over a larger area. A193 B8 Bolts are identified with head markings that include the unique manufacturers head stamp ID mark and the characters B8.

ASTM 194 Grade 8 Stainless Steel Heavy Hex Nuts are the correct matching hex nut specification meant for use with ASTM A193 Grade B8 Bolting.