This is a 12 Pitch (12 DP) spur gear with a 14 &1/2 degree pressure angle. The Pitch Diameter is 9 inches and it weighs 6.7 pounds and the catalog number is CG-12108.This gear will only mesh with other 12 Pitch gears that have the same 14 & 1/2 pressure angle. This is a stock gear and the bore in the center can be modified to fit a shaft of a different diameter. This gear was manufactured by: Union Gear and Sprocket Company 740 York Av. Pawtucket, RI. 02861 for further information contact www.traceygear.com There is no 'make or model' per say. Since this a "stock" gear it can be modified (the bore diameter) to fit any application be it a machine tool or other type of machine as long as the gear train is 12 Pitch and 14 & 1/2 pressure angle. John

This is a 12 Pitch (12 DP) spur gear with a 14 &1/2 degree pressure angle. The Pitch Diameter is 9 inches and it weighs 6.7 pounds and the catalog number is CG-12108.This gear will only mesh with other 12 Pitch gears that have the same 14 & 1/2 pressure angle. This is a stock gear and the bore in the center can be modified to fit a shaft of a different diameter. This gear was manufactured by: Union Gear and Sprocket Company 740 York Av. Pawtucket, RI. 02861 for further information contact www.traceygear.com There is no 'make or model' per say. Since this a "stock" gear it can be modified (the bore diameter) to fit any application be it a machine tool or other type of machine as long as the gear train is 12 Pitch and 14 & 1/2 pressure angle. John

References:

http://traceygear.com/union-gears.html