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ER TYPE COLLETS (DIN 6499)

ER collet is the most widely used clamping system in the world used for a variety of machining applications including boring, milling, reaming, tapping and grinding. Gem manufactures and exports ER type collets according to the customers' requirements also. While ordering sendus your drawing or sample, Machine make and model and quantity

Advantages of ER type collets

The advantages of Gem ER Type Collets are:

High polished finish for extra accuracy and long life, especially when clamped in ER chucks
Superior clamping strength
Fits all brands of ER holders

Benefits of ER type collets

The benefits of Gem ER Type Collets are:

Quality: Product consistency and worldwide acceptance
Material: Durability and increased collet life
Wide Clamping Range: Less collet inventory necessary
Broad Product Range: Versatility for a variety of applications
Clamping Length: Higher clamping power and improved T.I.R.
Matched Tooling System for Best Fit: Compatibility of the whole system results in maximum precision, balance and tool life
Precision: Increased tool life and part quality

Collet Dimensions

COLLET	L	L1	L2	L3	D	D1	D2
ER 11	18.0	3.80	2.0	2.5	11.5	11.0	9.5
ER 16	27.5	6.26	2.7	4.0	17.0	16.0	13.8
ER 20	31.5	6.36	2.8	4.8	21.0	20.0	17.4
ER 25	34.0	6.66	3.1	5.0	26.0	25.0	22.0
ER 32	40.0	7.16	3.6	5.5	33.0	32.0	29.2
ER 40	46.0	7.66	4.1	7.0	41.0	40.0	36.2

ER Collet Concentricity

CLAMPING RANGE D		L	MAXIMUM T.I.R
MIN	MAX	L	NORMAL PRECISION	HIGH PRECISION
1.0	1.6	6	0.015	0.010
1.6	3.0	10
3.0	6.0	16
6.0	10.0	25
10.0	18.0	40	0.020	0.015
18.0	26.0	50	0.020	0.015

Method of insertion & release of RD COllets

INSERTING

Insert collet into nut at angle as shown to engage extraction tongue in groove of collet.
Screw nut onto collet holder with collet securely in nut.
Insert tool to be gripped and lock nut.

RELEASING

Hold nut in vertical position.
Press collet side ways as shown by the arrow to release the collet from nut.

NOTE : Never screw nut onto collet unless collet is properly seated in nut.