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When precision counts

Choose high precision styli for high performance probing from Renishaw

Ensuring the integrity of your metrology data is crucial for in-process and quality control. The stylus is the first link between workpiece and probe. For this reason, it is vital your styli deliver the best possible performance at the point of contact.

At Renishaw we have used our expertise in probe and stylus design to develop a comprehensive range of styli for CMM and machine tool probing systems.

Car and stylus graphic white background

Did you know? Renishaw's ball standards are Grade 5 AFBMA 3290/DIN 5401-11.993, and Grade 3 with a form deviation of ± 0.008 microns.

Styli ball materials

Ruby stylus ball


The industry standard and the optimum stylus ball material for the majority of measurement application. Ruby is one of the hardest known materials.

Silicon Nitride stylus ball

Silicon nitride

Silicon nitride possesses many similar properties to ruby. It is a very hard and wear-resistant ceramic, which can be machined into very high precision spheres.

Zirconia Sylus ball


Zirconia is a particularly tough ceramic material. Its surface properties make it an ideal material for aggressive scanning applications on cast iron components.

Choosing a stylus

  • Keep styli short. The more that a stylus bends or deflects, the lower the accuracy of your measurement process. Probing with the minimum stylus length for your application is the best option.
  • Minimize joints. Every time you join styli and extensions, you introduce potential bending and deflection points. Try, wherever possible, to keep to the minimum number of pieces for your application.
  • Keep the ball as large as possible. It maximizes the ball/stem clearance thereby reducing the chances for false triggers caused by shaking out on the stylus stem. Also, the large ball reduces the effect of surface finish on the accuracy of measurement.