This company offers a wide selection of precision spheres in a range of materials. The spheres are available in diameters from 0.15 to 20 mm from stock, and up to 150 mm as a special order. Tolerances range from +/-0.5 to +/-10 microns, and sphericity from 0.075 to 2.500 microns.
Matte surface finishes are offered on a range of precision spheres; this can be particularly useful in applications where a reflective surface might cause problems, such as laser measurement.
For more information, visit www.goodfellowusa.com.