Page 686 - ISCAR(MILLINGCATALOG 38_2021)

USER GUIDE
ER, SC & SHRINK COLLETS

ER - Top Clamping Nut for DIN 6499 Collets

Description Extraction Procedure
Friction bearing ER nut is a nut with a unique 1 Align the engraved diamond shape which is on the
two-piece exclusive friction mechanism, combining silver ring (D), with any of the key slots (E) of the nut.
radial and angular self-centering movements. 2 Place the nut with the collet facing down on
a clean and horizontal work surface.
Features 3 Insert a screwdriver vertically between the
• Unique two-piece friction bearing nut slots and the collet on the reverse side
• Radial and angular float for better concentricity of the engraved diamond shape (D).
• Powerful gripping force, 50-100% higher than the 4 Tilt the screwdriver outwards, while helping
standard ER nut due to the friction bearing mechanism the extraction by pushing the collet’s back
• Balanced for higher spindle spin due to end in the opposite direction (F).
unique extractor teeth design
• Compact design - general dimensions and size E, D F
range are the same as the standard nut
• Designed for use with sealed collets E D
Always assemble the collet into the nut before mounting onto
the collet chuck.
Insertion Procedure
1 Insert the collet at an angle, fitting the two extractor
teeth which protrude (A) into the collet’s groove (B).
2 Place the two parts on a clean and
horizontal work surface.
3 Press down with your thumb on the back end
of the collet until it clicks into place (C).

A B C Nut type Kgxm
Collet Groove ER-11 5
ER-11M 3
ER-16 7
ER-16M 4
ER-20 12
ER-20M 8
ER-25 20
A A ER-32 22
Extractor Teeth ER-40 25
ER-50 35
Important: Never insert the collet parallel to the extractor Note: For maximum performance, the clamping nut thread and collet
ring. Doing this will chip or break the extractor’s teeth. taper must be cleaned and oiled before use.
When unclamping the nut, the collet will self-release
from the chuck by means of extractor teeth. Recommended Clamping Torque for Standard
ER & ER-Top Clamping Nut

Important: This torque is calculated with the maximum
diameter capacity per collet which should be gradually
reduced when used with a smaller shank size.

684 ISCAR