Rolled Threads
This type of thread is made by a forming process where threads are created as the fastener material passes through a hardened set of metal dies at high pressures. The dies penetrate the smooth, thread-less material creating a finished thread with perfectly formed thread roots and crests behind. H
Advantages
• More economical process as they are less labor intensive.
• By deforming and cold working the bolt in the rolling process the bolt becomes stronger (without tears and cracks of a cut thread) – hence more resilient.
• Rolled threads are smoother.
Cut Threads
A cut thread is made by actually cutting or machining into the round bar and removing material from the bulk piece to create the roots and peaks of the threads.
Disadvantages
• Cutting leaves behind tiny tears in the threads which can spread over time and compromise stability and longevity of the thread.
Advantages
• Can meet almost all specifications.
• Bolts can be manufactured to more specific size and dimensional requirements with few limitations regarding their diameter and thread length.
• Can create bolts at much higher diameters than the rolled thread process.
• Simple setup is ideal for small batch runs