Brass Hex Bolts | Brass Factory

Read on for information about using square head bolts. However, there are other types of square head bolts that are used in similar applications. The 316 stainless steel hex bolts also feature the manufacturer's marking, namely F-5-9-3-H. Whether you need to fasten heavy-duty machinery to small pieces of household equipment, hex bolts will fit the bill. Type B hex bolts, on the other hand, feature-heavy hex heads and are commonly used in structural applications and flanged joints in piping systems.