M5, Hemisphere styli, ceramic
Hemispherical styli consist of a stylus tip that has been cut off above the equator for weight reasons. The reason for this is a weight reduction, especially for large-diameter spheres, which can save up to 40% of the weight.
Tungsten carbide is the most common shaft material, it combines a very good stiffness with an acceptable thermal expansion. Only the weight can have a negative effect when using large styli. The straight shaft is the simplest stylus design and the one with the longest usable length. The full shaft length can be used as measuring length. Tungsten carbide shafts represent a good combination in terms of weight, rigidity and thermal expansion.
Ceramic is a very light material and is therefore mainly used for styli spheres with large diameters. Ceramic discs have a very low porosity and a high-precision. They are particularly suitable for scanning rough surfaces such as cast iron