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Model Engineering Glossary: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

ER Collets

The ER system is standardised as DIN 6499. This includes chuck, collets and clamping nut.

The big advantage of a collet is the tool or workpiece gets held around its complete perimeter (well nearly).

This is compared to a 3-jaw chuck where the part is held at 3 points.

The result is the part is less likely to move radially.


A collet system is a must for any milling machine.

See also: Collets, YS Tools ER Collet System.

Model Engineering Glossary: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z