Page 921 - Tungaloy Catalog

ER Collet

ER - Top Clamping Nut DIN 6499

Description: are the same as the standard nut.
Friction bearing ER nut is a nut with a unique two-piece • Designed for use with sealed collets.
exclusive friction mechanism combining radial and Always assemble the collet into the nut before
angular self-centering movements.
mounting onto the collet chuck.
Features: Insertion Procedure:
• Unique two-piece friction bearing. 1. insert the collet at an angle, fitting the two extractor
• Radial and angular float for better concentricity. teeth which protrude (A) into the collet’s groove (B).
• Powerful gripping force, 50-100% higher than the 2. Place the two parts on a clean and horizontal work
standard ER nut due to the friction bearing mechanism. surface.
• Balanced for higher spindle spin due to unique extractor 3. Press down with your thumb on the back end
teeth design. of the collet until it clicks into place (C).
• Compact design - general dimensions and size range

B Collet Groove
(C)

A A A A
A Extractor Teeth
Important: never insert the collet parallel to the Extraction Procedure
extractor ring. Doing this will chip or break the 1. Align the engraved diamond shape which is on the
extractor teeth. silver ring (D), with any of the key slots (E) of the nut
When unclamping the nut, the collet will 2. Place the nut with the collet facing down on a clean
self-release from the chuck by means of and horizontal work surface.
extractor teeth. 3. insert a screwdriver vertically between the nut slots
and the collet on the reverse side of the engraved
diamond shape (D).
4. Tilt the screwdriver outwards (G) , while helping the
=(E) extraction by pushing the collet’s back end in the
opposite direction (F). Tooling Systems

(D)
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! Note:
For maximum performance the clamping nut thread and collet taper must be
cleaned and oiled before use.
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.
Nut type N·m
ER-11 49
ER-11M 29.4
ER-16 68.7
ER-16M 39.2
(G) ER-20 117.7
ER-20M 78.5
(F) ER-25 196.1
ER-32 215.7
ER-40 245.1
ER-50 343.2

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