The easiest way to determine what type of collet your machine has is to measure the length and diameter of the collet.  All collets have a distinctive length and diameter.  Use the chart below to determine the correct collet series for your machine. If you need advice, give us a call on 01329 246070 or send us an email and one of our specialists will help you get the best performance out of your application. Always ensure sure you have the correct size for your CNC cutting tool.

The company is the world’s best Standard Collet Sizes supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.

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.

If you are looking for more details, kindly visit CNC toolholders.

Related links:
Exploring Overmolding vs. Gluing for Bonding Medical ... ER Collet Length Diameter Clamping Range ER-11 18 mm (0.71") 11.5 mm (0.45") 0.5—7 mm (0.020—0.276") ER-16 27.5 mm (1.08") 17 mm (0.67") 0.5—9 mm (0.020—0.354") ER-20 31.5 mm (1.24") 21 mm (0.83") 1—13 mm (0.039—0.512") ER-25 34 mm (1.34") 26 mm (1.02") 1—16 mm (0.039—0.630") ER-32 40 mm (1.57" 33 mm (1.30") 1—21 mm (0.039—0.827") ER-40 46 mm (1.81") 41 mm (1.61") 3—26 mm (0.118—1.024")
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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.

Chris' Tips
With all ER collet chucks, the collet must be snapped into the nut before placing it into the chuck. There is an eccentric ring inside the nut that engages the groove in the collet. That is what makes them self-ejecting. Tilt the collet again to remove it from the nut.

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—1.0 mm 4797 4613             1/16" 0.039—0.079" 1.0—2.0 mm 4601 4614 4620 5053   4558     3/32" 0.079—0.118" 2.0—3.0 mm 4398 4615 4621 5054 4332 4559 4333   1/8" 0.118—0.157" 3.0—4.0 mm 4454 4434 2443 5055 4332 4560 4333 5885 3/16" 0.157—0.197" 4.0—5.0 mm 4455 4435 4622 5056 4332 4561 4333 5886 7/32" 0.197—0.236" 5.0—6.0 mm 4399 4616 4623 5057 4332 4562 4333 5887 1/4" 0.236—0.276" 6.0—7.0 mm 4456 4436 2444 5058   4563   5888 5/16" 0.276—0.315" 7.0—8.0 mm   4617 4624 5059 4332 4564 4333 5889 11/32" 0.315—0.354" 8.0—9.0 mm   4619 4625 5060   4565   5890 3/8" 0.354—0.394" 9.0—10 mm   4618 2445 5061 4332 4566 4333 5891 13/32" 0.394—0.433" 10—11 mm     4626 5062   4567   5892 7/16" 0.433—0.472" 11—12 mm     4627 5063 4332 4568 4333 5893 1/2" 0.472—0.512" 12—13 mm     4628 5064   4569   5894 17/32" 0.512—0.551" 13—14 mm       5065 4332 4570 4333 5895 9/16" 0.551—0.591" 14—15 mm       5066 4332 4571 4333 5896 5/8" 0.591—0.630" 15—16 mm       5067 4332 4572 4333 5897 21/32" 0.63—0.669" 16—17 mm           4573   5898 11/16" 0.669—0.709" 17—18 mm           4574 4333 5899 23/32" 0.709—0.748" 18-19 mm           4575   5900 3/4" 0.748—0.787" 19—20 mm           4576 4333 5901 13/16" 0.787—0.827" 20—21 mm           4578   5903 27/32" 0.827—0.866" 21—22 mm               5904 7/8" 0.866—0.906" 22—23 mm               5905 15/16" 0.906—0.945" 23—24 mm               5906 31/32" 0.945—0.984" 24—25 mm               5907 1" 0.984—1.024" 25—26 mm               2908

 

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