Baldor 7309D .5HP, 3000/3600RPM, 3PH, 50/60HZ, 3420M, GRNDBaldor 7309D Additional Information ManufacturerBaldor Nameplate Output0. 5 Number of Poles2 Phase1 MultiplierG1 Shaft Diameter (In.)0. 625 Speed 3600 RPM Product Style GRINDER Wheel Bore Size (In.)0. 625 Wheel Diameter(In.)7 Wheel Face(.)1 Starting Method Full Voltage Frame250 Output @ Frequency 55. 00 KW @ 50 HZ Synchronous Speed @ Frequency 1500 RPM @ 50 HZ Voltage @ Frequency 400 V @ 50 HZ