HSK Spindle Runout Test Arbors

TAC Rockford's HSK Spindle Runout Test Arbors are the essential high-precision instrument for verifying the accuracy of your machine tool spindles. This critical gauge provides a fast, reliable, and definitive way to diagnose alignment and runout issues that directly impact part quality and tool life.


- Ultra-High Precision: Typically guaranteed radial runout of 0.003mm (3 microns / 0.0001") or better, ensuring the highest level of diagnostic accuracy.

- Manufactured from premium, hardened alloy steel and precision ground for stability and longevity.

- Each arbor is supplied with an individual Certificate.

- Contact us for other lengths, tapers, and other special requirements.

- Carrying cases are not included. Available case options listed below.

PSC / PSK Spindle Runout Test Arbors

Made to the ISO 26623 Standard. Maximum runout error 0.003mm / 3 micron / 0.00012”. A certificate of accuracy is included. Storage are cases not included.

KM Spindle Runout Test Arbors

TAC Rockford's KM Spindle Runout Test Arbors are the essential high-precision instrument for verifying the accuracy of your machine tool spindles. This critical gauge provides a fast, reliable, and definitive way to diagnose alignment and runout issues that directly impact part quality and tool life.


- Ultra-High Precision: Typically guaranteed radial runout of 0.003mm (3 microns / 0.0001") or better, ensuring the highest level of diagnostic accuracy.

- Manufactured from premium, hardened alloy steel and precision ground for stability and longevity.

- Each arbor is supplied with an individual Certificate.

- Contact us for other lengths, tapers, and other special requirements.

- Carrying cases are not included. Available case options listed below.

Steep Taper Spindle Runout Test Arbors

-Maximum runout error 0.003mm / 3 micron / 0.00012 inch
-Cylindricity ≤ 0.002mm / 2 micron / 0.00008 inch
-Carrying cases are not included (see below for case options).
-A certificate of accuracy is included. Traceable certificates available; contact us for details.
-Contact us for other lengths, tapers, and other special requirements.

HSK Standard Ball-End Runout Test Arbors

Ball end spindle runout test arbors are designed checking positioning accuracy of 5-axis machines, but can also be used in place of a standard runout test bars when a shorter length is required or for a touchoff point from the spindle face (ball end is ideal for this purpose).

PSC / PSK Taper Standard Ball-End Runout Test Arbors

Precision Spindle Analysis for 5-Axis Machining



Ensure the highest levels of accuracy and performance from your machine tools with the TAC Rockford PSC (Polygonal-Shank Taper) Ball End Test Arbor. Specifically designed for the verification of 5-axis machining centers, this precision instrument is essential for maintaining spindle health and positioning integrity.



Key Features:



PSC Taper Standard: Built to the ISO 26623 Standard for seamless integration and accurate seating in your PSC spindle.



5-Axis Positioning Accuracy: Primarily used for precisely checking the positioning accuracy of 5-axis spindles, especially the Rotary Tool Center Point (RTCP).



Spindle Runout Verification: Functions as a highly accurate runout test arbor to quickly and easily check that your machine spindle is running true.



Versatile Ball End: The precision ball end is ideal for establishing a consistent and repeatable touch-off point from the spindle face, a critical step for machine setup and calibration. It also provides a shorter alternative to standard runout bars when required.



Precision and Reliability: TAC Rockford's commitment to quality ensures a reliable instrument for periodic performance checks, verification after a machine crash, or installation/relocation.



Included Certificate of Accuracy: Each arbor comes with a certificate of accuracy to confirm its adherence to strict quality standards.

KM Taper Standard Ball-End Runout Test Arbors

Steep Taper Standard Ball-End Runout Test Arbors

Ball end spindle runout test arbors are designed checking positioning accuracy of 5-axis machines, but can also be used in place of a standard runout test bars when a shorter length is required or for a touchoff point from the spindle face (ball end is ideal for this purpose).

A2 and D1 Flanged Lathe Spindle Runout Test Bars

Test arbor for mounting to turning-center and measuring run-out. Designed for A2-5, A2-6, D1-8 etc. lathe face mounting. Also available for flat 110 and 140 lathe face.

Extended drawbar clearance versions have additional depth at the taper needed for drawbar clearance on certain lathes.