What is the manufacturing process for bolts?

Answer 1

Bolts come in a variety of sizes and shapes, but the basic manufacturing process is typically the same. It begins with cold forging steel wire into the desired shape, followed by heat treatment to increase strength and surface treatment to increase durability before being packaged for transportation. However, for more complex bolt designs, the production process might be extended by many phases.

Cold forging: Cold forging begins with massive steel wire rods that are uncoiled and trimmed to length. Steel grades are standardized across industries based on ISO 898-1 specifications. The wire is then cold forged into the desired form with specialized tools. This is where the steel is moulded at room temperature by driving it through a succession of dies under high pressure. The tooling itself may be fairly complicated, with up to 200 separate pieces and tolerances of hundreds of millimetres. Once developed, cold forging allows bolts to be made fast, in huge quantities, and with excellent consistency.

Heat treatment: Heat treatment is a typical technique for all bolts that entails subjecting the bolt to extremely high temperatures to harden the steel. Threading is often performed before heat treatment, either by rolling or cutting the steel when it is softer. Rolling, like cold forging, involves putting a bolt through a die to form and mould the steel into threads. Threads are formed by cutting and removing steel.

Also, do visit Bhansali Fasteners one of the leading Bolts Manufacturers in India. A bolt is a form of threaded fastener with an external male thread requiring a matching pre-formed female thread such as a nut. Bolts are very closely related to screws.