ERcollet DimensionsPDF

Stone fabricators often use tools with a 6 mm or 10 mm cylindrical shank, therefore 6 mm and 10 mm diameter ER collets are those most commonly used.

ER20Collet dimensions

ER25Collet dimensions

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ER collet clamping systems are widely used in all machining sectors and extensively for straight-shank diamond tools. The ‘ER’ numbers are loosely associated with the diameter of the interchangeable collets, measured in millimeters.

The ER Collet “diameter” refers to the diameter of the tool shank (tool-shank diameter) which the collet is designed to accommodate, which may vary from 3 mm up to 30 mm. This is the diameter of the diamond tool that you can use (tool shank diameter)