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27/64" Counterbore (For GC121 Bearing)

Quality high speed counterbores used to set your GTC bearing system. Select your counterbore for your chosen size ( outside diameter of the bearing). Then choose the pilot to fit the shank diameter of your pivot pin. Proper cutting depths are 0.50" for all bearings except GC102 with a cutting depth of 0.66".

27/64" counterbore for CG121 bearing system.

Choose your preferred pilot / shank.