Think & Tinker, Ltd.
CNC router bits and carbide cutting tools with tutorials and technical guides

We will be closed Monday December 24 and Tuesday December 25. For more information: Click here.


On December 1, 2018, the new Colorado sales tax rules took effect. For more information: Click here.

Ultra-Precision ER Collet Nuts and Wrenches

  • used in applications where speeds exceed 10,000 PRM
  • balanced to G2.5 for 20,000 RPM's
  • used on collet holders and multi-spindle heads where center or shoulder distances are critical.
ER20A Nut

ER20A Hex Nut

ER20M Nut

ER20M Mini Nut

ER-20 wrench

ER20M Castle Wrench

  • Steel : SCM430
  • H.R.C. 38-42
  • Surface Roughness: Ra 1.6um
  • Deburred & free of sharp edges & corners
  • purely tangential tightening torque
  • no radial nut distortion
  • castle design for high-torque tightening
  • secure, no-slip design