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ER Collets

ER Collet

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