sf-2y has the same structure and functional performance with sf-2. it can work long time without oil in the condition of prelubricated with lubrication indents.
该产品与sf-2具有相同结构和使用性能,在边界润滑条件下可长期使用而不加油,耐磨层表面有储油坑。
totally enclosed, thermally protected auto- reset, heavy-duty motors with sealed prelubricated ball bearing are the best u. s.