ER Collet Holder Extensions

ER straight shank extensions for collet chuck tool holders


ER straight shank extensions application diagram

Works with any tool holder!

  • ER Mini Nut included with each
  • 0.0001" runout from shank to pocket
  • Precision ground for best T.I.R.

Extension length should not exceed a 4 : 1 ratio of length to diameter. For example, a 1/2" shank should not extend more than 2" in front of the holder. This is only true for applications where the extension is rotating.

ER collet chucks handle a wide range of machining jobs without having to buy new tool holders. Simply choose the right size collet for the job, set tool depth, and tighten the collet nut and pull stud to the proper torque using a torque wrench and tightening fixure.

ER Straight Shank Extensions

Refer to the chart below to order ER Straight Shank extensions for collet chuck tool holders. Click on part number link to download the CAD file.
Part No.
d
C
I1
L
I2
I3
D
Set Screw
Wrench
Nut Type
04889
ER8
3/8"
100mm
124mm
24mm
6mm
12mm
-
04620
Mini
04891
ER11
1/2"
140mm
166.5mm
26.5mm
6.6mm
16mm
-
04621
Mini
04893
ER11
5/8"
140mm
158.5mm
18.5mm
6.6mm
16mm
-
04621
Mini
04895
ER16
1/2"
140mm
177mm
37mm
10.6mm
22mm
-
04622
Mini
04896
ER16
3/4"
140mm
165mm
25mm
10.6mm
22mm
16083
04622
Mini
04892
ER20
3/4"
140mm
180mm
40mm
11.5mm
28mm
16083
04623
Mini
04894
ER20
3/4"
140mm
180mm
40mm
11.5mm
28mm
16083
04623
Mini
04881
ER20
20mm
180mm
220mm
40mm
11.5mm
28mm
16083
04623
Mini
04897
ER20
1"
140mm
168mm
28mm
11.5mm
28mm
16083
04623
Mini
04898
ER25
3/4"
100mm
149mm
49mm
12mm
35mm
16087
04624
Mini
04888
ER25
1"
140mm
190mm
50mm
12mm
35mm
16083
04624
Mini