Bolton Tools ER40 3/8" Spring Collet Precision 8 micron Popular

1. Hole diameter: 3/8″, overall length is 1-13/16″ (46mm)

2. Material: high-grade 65Mn

3. Clamping range: 11/32″ – 3/8″ (0.339″ – 0.375″)

4. Total runout less than .00031 on these precise ER40 collets

Product Description

The following schematic diagrams and product pictures are only for reference.

If you have any questions, please contact us.

 Runout tolerance within 8 micron (0.00031″) at 4×d position

 Designed for use with cylindrical shank tools, not flats

 The full length of the cutting tool should be placed in the collet

 Made from 65Mn Alloy spring steel , vacuum annealing and hardened to HRC 42-45

Each collet gone through thermal aging process to eliminante grinding residual stress and long cryogenic treatment to imoproce wear resistance

 This ER40 collet has a range of 11/32″ – 3/8″ (0.339″ – 0.375″)

 Works in all ER40 Collet Chucks

 Installation Instruction

1. Put the collet into the nut and gently rotate the nut, then the eccentric part of the nut is in the grooves, and the package is pushed evenly along the arrow, and it can be

loaded into the nut

2. Install the collet and the nut on the shank or machine tool shaft together, wipe the tool cylinder handle into the clamping hole, and tighten the nut evenly with the wrench,

until the tool clamp can be used. (Note: install tools before fasten the nut so as not to damage the collet)

3. When changing the tools, release the nut and collet with the wrench, unload the tools, push the collet along the arrow direction, make it quit, and then change the other

collet you needed