Woodruff key sizes, dimensions and tolerances are given in the following chart according to ASME B17.2 standard.
Woodruff key is almost in semicircular disk shape with uniform thickness and it's a demountable machinery part that provides means for transmitting torque between the shaft and hub.
Note 1 : The last two digits of the key number give the nominal diameter B in eighths of an inch and
the digits preceding the last two give the nominal width W in thirty-seconds of an inch. Ex: No. 1212 indicates a key 12/32 x 12/8 or 3/8 x 1-1/2
Note 2 : Length tolerance : +0.000 -0.010 .