Common Types Of Bolts And Their Applications When we talk about fasteners, the two common things that strike our mind are nuts and bolts. Similarly, when we talk about leading Hex Bolt Manufacturers In Ludhiana, Swarna Fasteners is the name that hits our senses. They deal in multiple kinds of fasteners such as bolts, nuts, rods, etc. In this blog, we’ll tell you about some common bolts and their applications: Carriage Bolts - This fastener type is fully threaded and comes with a smooth head and a square or ribbed undercut. The undercut is designed to prevent the bolt from turning when tightened. Application: It helps in combining metal and wood together. Hex Bolts –These are designed in a way that they are fully or partially threaded with six-sided heads. Applications: This fastener is used for many purposes such as construction and repair of bridges, docks, highway elements and buildings. J Bolts – These are shaped like the English alphabet ‘J’. The curved section is non-threaded and the non-curved section is threaded.