Hexagon bolts are either thread rolled in In-feed rolling for standard length bolts and through-feed thread rolling for full thread bolts or screws.
What is thread rolling?
Thread rolling is a mechanical process where threads are cold formed when the part is squeezed between two thread dies on a thread rolling machine. Thread rolling provides for a stronger thread and no loss of material.
What are the primary benefits of thread rolling compared to conventional thread cutting?
- Raw material savings
• 1/4-20 thread pattern produced approximately a 25% savings
• 3/4-16 thread pattern at approximately 16% - Increased thread strength over machined threads
• Tensile strength increases 10%
• Root hardness increase up to 30% - Reduced manufacturing times up to 70%
- Superior surface smoothness over other techniques
- Grain Structure retained.
