Cylindrical Grinder Spindle Parker Majestic style 2251 precision belt driven grinding spindle for 17,000 or 21,000 rpm operation. This spindle accepts 5/8" series quills or an RD16 collet chuck and ER16 collets. 3. Cylindrical Grinder Spindle Parker Majestic style 2621 precision belt driven grinding spindle for 25,000 or 30,000 rpm operation.