Many customers in geotechnical, tunnel and mining sectors often confuse PSB fully threaded bars with standard roll-threaded rock bolts. They look alike, but their process, load capacity and long-term performance are very different.
1. How Roll-Threaded Rock Bolts Are Made
Roll-threaded rock bolts start as smooth bars. Threads are rolled on later, as a secondary process. Only the surface steel is pressed, so the threads are shallow, with stress concentration at the root. After galvanizing, zinc nodules can deform the threads and jam the nuts. Thread quality also varies between batches, so fitting with nuts and couplers is unreliable under heavy loads.
2. How Fully Threaded Bars Are Made
PSB fully threaded bars are hot-rolled in one piece. The threads and the bar form together at high temperature, so the threads are part of the bar itself. The steel structure stays uniform, with no surface hardening or microcracks from post rolling. The full thread profile gives better stress distribution and better fatigue and tear resistance.
3. YIDAO METAL Bar Range
YIDAO METAL PSB bars range from PSB500 to PSB1200, with consistent thread sizes. Every bar is nut-tested before shipment to prevent jamming. We supply matching anchorage parts, and we can custom-make nuts and couplers to fit other brands.
4. Project Tips
For slope stabilization, deep tunnels, high-stress mines and permanent prestressed anchorage under cyclic loads, choose hot-rolled PSB bars. They give safer performance and lower risk of slippage and breakage.
Roll-threaded bolts are good for low-load, short-term temporary support. They cost less, but they are not suitable for critical permanent prestressed works.
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