ER40 Coolant Collets – RD40 Sealed Collets Lexis ER40 Sealed Collets are manufacturing at par with DIN 6499 Standard Table. Sealed collets also known as Coolant Collets having two different models Internal coolant Collet and External Coolant Collet. Lexis ER Sealed collets are available with internal flow for oil hole tools or, with external flow (coolant canals through the collet) for use with cutting tools with or without oil holes. The external flow collets are especially beneficial for applications where there is coolant through the spindle but lower cost solid cutting tools are desired or applications where oil hole tools are used in through holes. Lexis ER40 Collet RD40 Collet ER40 Collet ER Collets ER 40 Collets ER40 Coolant Collet ER40 Sealed Collet ER40 IK Coolant Collet ER40 EK Coolant Collet