How many types of bolts?

There are several types of bolts, with the most common being hex bolts, carriage bolts, lag bolts, and machine bolts. Each type has specific designs and uses; for example, hex bolts are typically used in construction and machinery, while carriage bolts are used in wood applications. Additionally, there are specialty bolts like anchor bolts and U-bolts designed for specific purposes. In total, there are dozens of variations and standards across industries.