From automotive to marine, coastal, and high temperature environments, this specific type of bolt can be used—the ordinary hexagonal bolt, or hex bolt. As its name implies, ordinary hex bolts have a hexagonal head and come with machine threads for a firm and rough handling. Hex bolts are available with standard threading or full threading, depending on the length of the bolt.
Hex bolts are also called hexagon screw head bolts, hex cap bolts, hex-cap screws, or machine bolts. They are a very common choice when it comes to construction and repair. There is a variety of sizes and diameters. Whichever bolt you choose, just make sure that it’s from a credible bolt and nut supplier.
A B.I. hex bolt means it’s black iron instead of galvanized iron. The latter has zinc to prevent corrosion. The disadvantage of this, however, is it can’t be used in gas lines as the zinc starts to react with gas, causing flaking, overtime.