I'm not a moderator, but I'll give it a shot.
From the grinder description:
Spindle: 5/8''-11
From the Adapter description:
This handy accessory fits a 5/8" shaft to extend the stubby shaft out 3" further from the motor body.
As a Manufacturing Engineer, if only the major diameter of the thread is given, one should assume it is a coarse thread. Therefore the adapter most likely has a 5/8 - 11 thrd also.
Be aware, the adapter appears to use 1/2 ID wheels.
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