Plain bearings, also known as sleeve bearings, rely on sliding friction to support rotating shafts without rolling elements. They boast compact size, low noise and strong shock resistance, performing steadily under heavy load and low-speed operating scenarios. Equipped with self-lubricating layers or oil grooves, they greatly reduce wear and maintenance frequency. Widely applied in construction machinery, fitness equipment and industrial metal frames, our plain bearings adopt wear-resistant alloy materials, meet EU quality standards, and can be customized to match damping and weight-adjusting square tube projects for the Spanish market.