ST - ER COLLET CHUCK A ➚ A .00020 58-60 HRc Ra 4µin L1 L Ref T (1) A D D J A A-A Designation Range L1 L J D1 D T ** ST5/8X2.50 ER11F* .022-.278 2.500 .734 M8 .625 .748 .512 ST3/4X2.50 ER11F* .022-.278 2.500 .734 M10 .750 .748 .669 ST3/4X4.00 ER11 .022-.278 4.000 .734 M10 .750 .748 .669 ST3/4X6.00 ER11 .022-.278 6.000 .734 M10 .750 .748 .669 ST3/4X2.50 ER16F* .022-.396 2.500 1.187 M12 .750 1.102 .748 ST3/4X4.00 ER16 .022-.396 4.000 1.187 M12 .750 1.102 .748 ST3/4X6.00 ER16 .022-.396 6.000 1.187 M12 .750 1.102 .748 ST3/4X2.50 ER20F* .041-.514 2.500 1.656 M12 .750 1.339 .866 ST3/4X4.00 ER20 .041-.514 4.000 1.656 M12 .750 1.339 .866 ST3/4X6.00 ER20 .041-.514 6.000 1.656 M12 .750 1.339 .866 * With a flat ** Wrench size 825