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What Are ER Collets and How To Use

Originally published at: What Are ER Collets and How To Use - CNC Routers | 3DTEK

What are ER Collets

ER collets are used on CNC spindles. Different sized spindles have their own collet size. Typically the bigger the spindle (power and size) the bigger the ER collet. For example, 3DTEK sell spindles with a 65mm body diameter 1.5kW <3kg with an ER11 collet. Also, 80mm body diameter 1.5kW 5kg with an ER16 collet and Finally 80mm body diameter 2.2kW, 5.3kg with an ER20 collet. See the trend? We found this handy table below to show the trends and shank diameters endmills you can use with ER collets:

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

How to use an ER Collet

IMPORTANT NOTE:

Always keep your collets clean and free of debris. They will not crush evenly with debris build up in the slots. Do ensure you blow out (air line or other) the male and female thread (spindle and nut) as swarf or debris will damage the thread and replacing the spindle shaft is not cheap!!

 

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–3DTEK

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