ER Collet Sizes
ER collets have a wide clamping range and high accuracy. While they are designed for tool holding, they work great for work holding in small lathes. With a full set of ER collets you can hold any diameter that is in the clamping range of the set.
| ER Collet | Length | Diameter | Clamping Range |
|---|---|---|---|
| ER-11 | 18mm (0.71") | 11.5mm (0.45") | 0.5 – 7mm (0.020—0.276") |
| ER-16 | 27.5mm (1.08") | 17mm (0.67") | 0.5 – 9mm (0.020—0.354") |
| ER-20 | 31.5mm (1.24") | 21mm (0.83") | 1 – 13mm (0.039—0.512") |
| ER-25 | 34mm (1.34") | 26mm (1.02") | 1 – 16mm (0.039—0.630") |
| ER-32 | 40mm (1.57" | 33mm (1.30") | 1 – 21mm (0.039—0.827") |
| ER-40 | 46mm (1.81") | 41mm (1.61") | 3 – 26mm (0.118—1.024") |
There are several types of collets that look like ER collets. If your collet looks like an ER collet but does not match one of the sizes shown above, it is a different type of collet and not an ER collet.
The table below shows the available sizes of ER collets. Click the collet size at the top of the column (ER-32, for example) to go to the page that lists all the collets in that size range. This makes ordering several collets in the same size range simple.
| Size | Range (in) | Range (mm) | ER-11 | ER-16 | ER-20 | ER-25 | Metric ER-25 |
ER-32 | Metric ER-32 |
ER-40 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1/32" | 0.020 – 0.039" | 0.5 – 1.0mm | 4797 | 4613 | ||||||
| 1/16" | 0.039 – 0.079" | 1.0 – 2.0mm | 4601 | 4614 | 4620 | 5053 | 4558 | |||
| 3/32" | 0.079 – 0.118" | 2.0 – 3.0mm | 4398 | 4615 | 4621 | 5054 | 4332 | 4559 | 4333 | |
| 1/8" | 0.118 – 0.157" | 3.0 – 4.0mm | 4454 | 4434 | 2443 | 5055 | 4332 | 4560 | 4333 | 5885 |
| 3/16" | 0.157 – 0.197" | 4.0 – 5.0mm | 4455 | 4435 | 4622 | 5056 | 4332 | 4561 | 4333 | 5886 |
| 7/32" | 0.197 – 0.236" | 5.0 – 6.0mm | 4399 | 4616 | 4623 | 5057 | 4332 | 4562 | 4333 | 5887 |
| 1/4" | 0.236 – 0.276" | 6.0 – 7.0mm | 4456 | 4436 | 2444 | 5058 | 4563 | 5888 | ||
| 5/16" | 0.276 – 0.315" | 7.0 – 8.0mm | 4617 | 4624 | 5059 | 4332 | 4564 | 4333 | 5889 | |
| 11/32" | 0.315 – 0.354" | 8.0 – 9.0mm | 4619 | 4625 | 5060 | 4565 | 5890 | |||
| 3/8" | 0.354 – 0.394" | 9.0 – 10mm | 4618 | 2445 | 5061 | 4332 | 4566 | 4333 | 5891 | |
| 13/32" | 0.394 – 0.433" | 10 – 11mm | 4626 | 5062 | 4567 | 5892 | ||||
| 7/16" | 0.433 – 0.472" | 11 – 12mm | 4627 | 5063 | 4332 | 4568 | 4333 | 5893 | ||
| 1/2" | 0.472 – 0.512" | 12 – 13mm | 4628 | 5064 | 4569 | 5894 | ||||
| 17/32" | 0.512 – 0.551" | 13 – 14mm | 5065 | 4332 | 4570 | 4333 | 5895 | |||
| 9/16" | 0.551 – 0.591" | 14 – 15mm | 5066 | 4332 | 4571 | 4333 | 5896 | |||
| 5/8" | 0.591 – 0.630" | 15 – 16mm | 5067 | 4332 | 4572 | 4333 | 5897 | |||
| 21/32" | 0.63 – 0.669" | 16 – 17mm | 4573 | 5898 | ||||||
| 11/16" | 0.669 – 0.709" | 17 – 18mm | 4574 | 4333 | 5899 | |||||
| 23/32" | 0.709 – 0.748" | 18 – 19mm | 4575 | 5900 | ||||||
| 3/4" | 0.748 – 0.787" | 19 – 20mm | 4576 | 4333 | 5901 | |||||
| 13/16" | 0.787 – 0.827" | 20 – 21mm | 4578 | 5903 | ||||||
| 27/32" | 0.827 – 0.866" | 21 – 22mm | 5904 | |||||||
| 7/8" | 0.866 – 0.906" | 22 – 23mm | 5905 | |||||||
| 15/16" | 0.906 – 0.945" | 23 – 24mm | 5906 | |||||||
| 31/32" | 0.945 – 0.984" | 24 – 25mm | 5907 | |||||||
| 1" | 0.984 – 1.024" | 25 – 26mm | 2908 |