... hours 2. bearing can be NSK, SKF, stainless steel Roller for conveyor plastic conveyor roller , belt conveyor roller , steel conveyor ... .applicable situation indoor convey4. advantages1) low noise 2) suitable for high speed running 3) good looks 4) high quality, ... ×20Ø20M12×253)Mortise mounting wayMortise mounting way is used for mine idler normally. The convenient install way, frame punched with ...