RD40 Collets RD40 Collet system are standardized and manufactured as per DIN 6499 standard guidelines and are truly interchangeable. This becomes important to users that may have toolholding systems from different Toolholding System Manufacturers. Lexis tooling RD40 Collets are designed to collapse with 1mm or .039. Never try to install a cutting tool with a larger shank than the maximum or nominal diameter of the collet to expand the collet. For example: If the cutting tool shank is 4.2mm a 4-3mm is not suitable. A 4.5-3.5mm collet would be required. Sealed Collets for coolant through applications do not have a collapse range, and must be used at exact size. Maximum tightening torque for ER40 Collet is 90 ft/lbs. Lexis RD 40 Collet metric sizes starting from 4-3mm Dia to 26-25mm with 1mm incremental and RD 40 Collet Inch sizes available from 1/8 to 1Inch. RD40 Collets also known as in the market as ER40 Collet system All Lexis ER Collets designed with DIN 6499 manufactured RD40 Collet with Form B Standard system Lexis ER40 Collet have high precision range for special applications On request Lexis can offer ER40 Collets with 0.5mm collapse range ER40 Colletset metric sizes have 23 quantities ER40 Collet set Inch sizes have 25 collets ER40 Coolant Collet for coolant fed uses which can withstand upto 1000 psi pressure Special ER40 Sealed Collet can withstand upto 150 bar / 2000 psi pressure ER40 Tap Collet with superior design in back of the collet performances as a drive for the tap square. ER40 Tap Sealed Collet superior design in back of the collet performances as a drive for the tap square along with coolant fed uses.