Rainbow Precision Products offers best quality Oil Filled Bronze Bushing with affordable price and fast shipping. Powdered metal bearings (SAE 841) are used in applications that call for completely wear-resistant components. Self-lubricating powdered metal bronze bushings are made by blending powders, shaping the mixture into the required sizes, and heating it in oven to bond the particles. The next step in the process is to size the bronze bushing; this involves placing the material back into the dye and press it into the finished shape.