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Replacement Part for M.C 31mm To 19mm Tapping Motor Connector Adapter Pneumatic Tapper Coversion Chuck
The head shank diameter of GT12 is 19mm, and that of TC820 is 31mm.
If you purchase a GT12 chuck and need to use it on a M24HR/M30R/M36R tapping machine, you will need a 31 to 19mm conversion chuck.