Standard hex bolts feature longer shanks and thread lengths than heavy hex head structural bolts. Steel-to-steel pieces and connections are secured by structural bolts. Ratchets or spanner torque wrenches are used to tighten the hex heads. Galvanized, yellow zinc, and black oxide coatings are available on these tough steel bolts. Heavy hex bolts are utilized in high-temperature, high-strength industrial applications and have larger, thicker heads than standard hex bolts. Headed anchor bolts are generally made of heavy hex bolts with forged heads. For a secure fit, they're all designed to be utilized with hex nuts.