June 14th 20116 - Kohara Gear has changed the shape of several spur gears to remove the trepanning groove in the face of these gears.
The gears that are affected are all of the SSA series hubless gears with an S6 or S6K shape. The new products will be introduced with production lots starting September 1st 2016.
For stock gears:
S6 Shape is now S5 Shape
and for J Series products:
S6K Shape is now S5K Shape