ST - DOUBLE ENDED MINI COLLET CHUCK WITH A FLAT - METRIC A ➚ A .00020 58-60 HRc Ra 4µin T T D1 D D h6 d L Ref L1 L Ref Designation Range D D1 h6 d L1 L T* Machine Type ST 16X 50 ER11 MF D 0.5-7 16 16 7.5 50 18.5 14 ST 20X 30 ER11 MF D 0.5-7 16 20 7.5 30 18.5 17 ** ST 20X 50 ER11 MF D 0.5-7 16 20 7.5 50 18.5 17 ** ST 20X 55 ER16 MF D 0.5-10 22 20 10.5 55 25.0 17 ** ST 22X 55 ER16 MF D 0.5-10 22 22 10.5 55 28.0 19 *** ST 22X 75 ER16 MF D 0.5-10 22 22 10.5 75 28.0 19 *** ST 25X 62 ER16 MF D 0.5-10 22 25 10.5 62 28.0 22 ST 32X 55 ER20 MF D 1-13 28 32 13.5 55 28.0 27 *** ST 32X 75 ER20 MF D 1-13 28 32 13.5 75 28.0 27 *** * Wrench size ** Citizen *** Star 830