ER SPRING COLLET ::                  DIN 6499 FORM B
 
Collet Type Bore Range-d Clamping Per Collet Collapse Per Collet D

L
From To In Steps From To
ER8 0.5 5 0.5 0.5 5.0 0.5 8.5 13.5
ER11 0.5 7 0.5 0.5 7.0 0.5 11.5 18.0
ER16 0.5 10 1.0 0.5 10.0 1.0 17.0 27.0
ER20 1.0 13 1.0 1.0 13.0 1.0 21.0 31.0
ER25 1.0 16 1.0 1.0 16.0 1.0 26.0 35.0
ER32 2.0 20 1.0 2.0 20.0 1.0 33.0 40.0
ER40 3.0 26 1.0 3.0 26.0 1.0 41.0 46.0
ER50 10.0 34 2.0 10.0 34.0 2.0 52.0 60.0
        ER COLLET CONCENTRICITY - AS PER DIN 6499 ::
 
Metric
Clamping Range d L Maximum T.I.R
Min Max Precision DIN 6499 High Precision DIN 6499
1.0 1.6 6 0.015 0.008
1.6 3.0 10
3.0 6.0 16
6.0 10.0 25
10.0 18.0 40 0.020 0.010
18.0 26.0 50
26.0 34.0 60 0.025  

INSERTING
:: Place collet into the nut at an angle as shown to engage eccentric projection of nut with groove of collet.
:: Press the collet as shown to engage the collet in to the nut.
:: Only then mount nut and collet together into the coller holder or machine spindle.
 

  

RELEASING
:: Unscrew the nut from collet chuck.
:: Hold the nut in hand and press the colelt by other hand as shown in figure.
 
               NOTE ::
Never use a 14 -13 mm collet to clamp 14.2mm dia shank, but rather use a 15 - 14mm collet.
 
 
 
 
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