ER Collets
| Clamping range | ER16 | ER20 | ER25 | ER32 | ER40 | ER50 | mm | inch | 1-0.5 | 0.039-0.019 | ER16-D01 | 2-1 | 0.079-0.039 | ER16-D02 | ER20-D02 | ER25-D02 | 3-2 | 0.118-0.079 | ER16-D03 | ER20-D03 | ER25-D03 | ER32-D03 | 4-3 | 0.157-0.118 | ER16-D04 | ER20-D03 | ER25-D04 | ER32-D04 | ER40-D04 | 5-4 | 0.197-0.157 | ER16-D05 | ER20-D04 | ER25-D05 | ER32-D05 | ER40-D05 | 6-5 | 0.236-0.197 | ER16-D06 | ER20-D05 | ER25-D06 | ER32-D06 | ER40-D06 | ER50-D06 | 7-6 | 0.276-0.236 | ER16-D07 | ER20-D06 | ER25-D07 | ER32-D07 | ER40-D07 | ER50-D07 | 8-7 | 0.315-0.276 | ER20-D08 | ER20-D07 | ER25-D08 | ER32-D08 | ER40-D08 | ER50-D08 | 9-8 | 0.345-0.315 | ER20-D09 | ER20-D08 | ER25-D09 | ER32-D09 | ER40-D09 | ER50-D09 | 10-9 | 0.394-0.354 | ER20-D10 | ER20-D09 | ER25-D10 | ER32-D10 | ER40-D10 | ER50-D10 | 11-10 | 0.433-0.394 | ER20-D10 | ER25-D11 | ER32-D11 | ER40-D11 | 12-11 *(12-10) | 0.472-0.433 (0.472-0.394) | ER20-D11 | ER25-D12 | ER32-D12 | ER40-D12 | *ER50-D12 | 13-12 | 0.512-0.472 | ER20-D12 | ER25-D13 | ER32-D13 | ER40-D13 | 14-13 *(14-12) | 0.551-0.512 (0.551-0.472) | ER25-D14 | ER32-D14 | ER40-D14 | *ER50-D14 | 15-14 | 0.591-0.551 | ER25-D15 | ER32-D15 | ER40-D15 | 16-15 *(16-14) | 0.630-0.591 (0.630-0.551) | ER25-D16 | ER32-D16 | ER40-D16 | *ER50-D16 | 17-16 | 0.669-0.630 | ER32-D17 | ER40-D17 | 18-17 *(18-16) | 0.709-0.669 (0.709-0.630) | ER32-D18 | ER40-D18 | *ER50-D18 | 19-18 | 0.748-0.709 | ER32-D19 | ER40-D19 | 20-19 *(20-18) | 0.787-0.748 (0.787-0.709) | ER32-D20 | ER40-D20 | *ER50-D20 | 21-20 | 0.827-0.787 | ER40-D21 | 22-21 *(22-20) | 0.866-0.827 (0.866-0.787) | ER40-D22 | *ER50-D22 | 23-22 | 0.906-0.866 | ER40-D23 | 24-23 *(24-22) | 0.945-0.906 (0.945-0.866) | ER40-D24 | *ER50-D24 | 25-24 | 0.984-0.945 | ER40-D25 | 26-25 *(26-24) | 1.024-0.984 (1.024-0.945) | ER40-D26 | *ER50-D26 | 28-26 | 1.102-1.024 | ER50-D28 | 30-28 | 1.181-1.102 | ER50-D30 | 32-30 | 1.259-1.181 | ER50-D32 | 34-32 | 1.338-1.259 | ER50-D34 |
( * ) ER50 size in 2mm range, above 10mm