Important Note:
Many of the cheaper testbars on the web have much lower tolerances=less cost
High tolerance testbars are Important which is why we sell them.The largest cause of excessive tool wear and tool breakage are directly caused from machine tool spindle runout as well as excessive slop or axial play. The spindle runout test bar can be used to test your CNC machine tools for accuracy and alignments, and also to ensure a stable production environment as well as consistency moving jobs from one machine to another.
Spindle Runout Testbars are easy to use and a fast way to verify your machine spindle is running properly. Check them after a machine has been crashed and take the proper steps before you start making scrap parts.
Spindle testbar runout tolerances and accuracy
- CAT/BT/ISO/DIN - Maximum runout error 0.003mm / 3 micron / 0.0001 inch.
- HSK - Maximum runout error 0.003mm / 3 micron / 0.0001 inch
- KM - Maximum runout error 0.005mm / 5 micron / 0.0002 inch.
- Capto - Maximum runout error 0.005mm / 5 micron / 0.0002 inch.
- Big Plus/Sual Contact
- Runout arbors include certificates.
Does not include retention knobs (use one from your machine as they are different for machines).
These are surface hardened and not a soft material like many of the cheaper test bars available on the market.
Runout Test Bars are available for all major machine tapers |
BT / DIN / CAT |
HSK |
A2 |
Capto |
KM |
Morse |
VDI Testbars |
Steep Taper |
50 taper test bar, 40 taper test bar, 60 taper test bar tools used to check all your spindles machines are available. If we do not have specific testbar tool holder listed give us a call to quote.
Click Links in The TestBar Table Below To Purchase
* If you have any questions or special requirements for other lengths and tapers, please contact us and we will help you out! *
Pull Stud Thread size |
CAT40 |
5/8 inch - 11 inches |
CAT50 |
1 inch - 8 inches |
BT30 |
M12 x 1.75 |
BT40 |
M16 X 2.0 |
BT50 |
M24 X 3.0 |
Most common spindle testbar is a CAT40 or CAT50 runout test bar arbor.
Call for current availability - we generally have in-stock CAT, BT Test Bars, others are generally a 1-2 days before we can ship.
Click Links in the Table Above To Purchase