Home / Tech Data / Collets Tech Guide

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Use the guide below for selecting your replacement collets.  The best way to tell what type of collet you use is to measure the length of the collet.  ER, TG, and SYOZ collets all have unique length and diameter measurements. The dimensions below will help determine Tool Holder Collet Type.

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ER TYPE COLLETS

Collet Style      Length         O.D. (diameter)
ER 11         18mm (0.708")         11.5mm (0.45")
ER 16         27.5mm (1.08")        17mm (0.67")
ER 20         31.5mm (1.24")        21mm (0.83")
ER 25         34mm (1.34")           26mm (1.02")
ER 32         40mm (1.57")           33mm (1.3")
ER 40         46mm (1.81")           41mm (1.61")
                                                             ER 50         60 mm (2.36")           52mm (2.05")

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SYOZ, EOC COLLETS

Collet Style      Length           O.D. (diameter)
EOC 8             26mm (1.026")       14.4mm (0.567")
SYOZ 20         34mm (1.34")          20mm (0.78")
RDO 20          34mm (1.34")          20mm (0.78")
407E              34mm (1.34")           20mm (0.78")
EOC 12          34mm (1.34")           20mm (0.78")
SYOZ 25        52mm (2.06")           35mm (1.38")
RDO 35          52mm (2.06")          35mm (1.38")
                                                               462E               52mm (2.06")          35mm (1.38")

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Click for Quick Print - Collet Measuring Guide

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Tool Holders

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Collets

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