Diatool ER Hydraulic Compensation Chuck

Diatool ER Hydraulic Compensation Chucks convert standard ER holders to a repeatable, steerable hydraulic chuck for more precise machining.

Less than 2-µ runout is attainable for ER20, ER25, ER32, and ER40 collet chuck holders, offering the benefits of a hydraulic chuck without the high investment. Their adjustability of concentricity allows users to achieve proper tool alignment every time.

Initial setup is easy and future tool changeout only requires loosening a single screw. There's no need to reindicate at every tool change, saving time and ensuring precision. The chuck can be adjusted to compensate for any runout in the spindle, making it ideal for many uses including tight tolerance reaming or drilling applications.

  • ER20, ER25, ER32, and ER40
  • Convert current ER collet systems to hydraulic with ease. No need to invest in new holders—just adapt what you already have
  • One-time setup


  ER20  ER25 ER32 ER40
L 40 46 52 56
c 16 20 26.5 30
b 24 26 25.5 26
øD 35 48 52 62
ød-h5 12 16 20 25


ER Hydraulic Compensation Chuck Spec Sheet

Monaghan Tooling Group
Dayton, OH
(800) 732-4565

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