8" x 20" OKAMOTO HORIZONTAL SURFACE GRINDER, Model 820N, Auto Downfeed,8" x 20" Magnetic Chuck, 8" Wheel Size, 15.6" Height Under Wheel, 3 HP, New 1981.
| Down Feed | Yes | Yes |
| Spindle (Horz/Vert) | Horizontal | Horizontal |
| Magnetic Chuck Working Surface-L | 20" | 508 mm |
| Magnetic Chuck Working Surface-W | 8" | 203.2 mm |
| Max Height Under New Wheel | 15.6" | 396.24 mm |
| Max Longitudinal Travel | 25.59" | 649.99 mm |
| Cross Travel | 9.05" | 229.87 mm |
| Cross Feed Handwheel Graduation | 0.0004" | 0.0102 mm |
| Vertical Handwheel Graduation | 0.00005" | 0.0013 mm |
| Table Longitudinal Feeds Range (Variable) | 1 - 83 ft/min. | 25.3 m/min. |
| Max Spindle Speed | 6,000 RPM | 6,000 RPM |
| Max Grinding Wheel Diameter | 8" | 203.2 mm |
| Max Grinding Wheel Width | 1" | 25.4 mm |
| Max Grinding Wheel Hole Diameter | 1.25" | 31.75 mm |
| Grinding Wheel Power | 3 hp | 2.2 kW |
| Electrics | 230/3/60 | 230/3/60 |
| Dimensions | 90" x 65" x 72" | 90" x 65" x 72" |
| Weight | 3,500 lbs | 3,500 lbs |
Electro-magnetic chuck with rectifier and neutrofier, Automatic incremental downfeed, Vertical feed to wheelhead, Manual operation or Automatic incremental down feed, Okamoto electronic controls for all machine functions and cycles, Coolant System, Magnetic Separator Hydraulic System, Coolant Pump and Tank.
