Capacity is not the hole size, however is directly related to the hole size.
Capacity refers to the outside dimensions of the collet.
Capacity = Maximum hole size.
For example, a 3/8 capacity collet is available in many different hole sizes, up to 3/8".
Refer to the table below to find the proper capacity of your collet
CAPACITY | RANGE | D | Z | L |
1/4 |
1/32 - 1/4 (AF00 - AF14) |
0.438 | 0.25 | 1.00 |
3/8 |
1/16 - 3/8 (AF21 - AF44) |
0.562 | 0.25 | 1.03 |
1/2 |
7/64 - 1/2 (AF55 - AF82) |
0.720 | 0.25 | 1.16 |
3/4 |
7/64 - 3/4 (AF95 - AF140) |
1.131 | 0.63 | 2.02 |
1" |
7/32 - 1" (AF162 - AF213) |
1.446 | 0.74 | 2.50 |
1-3/8 |
11/32 - 1-3/8 (AF241 - AF286) |
1.909 | 0.91 | 3.11 |
1-5/8 |
19/32 - 1-5/8 (AF331 - AF377) |
2.125 | 0.90 | 3.13 |