Profile: Double D Bolt is a supplier & distributor of nuts and bolts. We supply bolts for all types of applications, from industrial to the one needed bolt for a personal project. We carry metric and fine metric bolts. Fasteners, including screws, nuts, bolts, and rivets, play an integral role in numerous industrial applications. They are often used to hold product components together, and common types of fasteners can be found in daily use, from the safety pins & buttons. Bolts are used in all facets of human existence. Technically defined, a bolt is a threaded fastener that is intended for use with a nut. It can be made from many different materials such as tempered steel, zinc, steel alloy, stainless steel, or brass.