Miniature Sapphire and Ruby Balls

A full line of miniature high-precision sapphire and ruby balls for use in instruments, metering equipment, and other precision mechanisms where low friction bearings, long-life, and dimensional accuracy are important have been introduced by Meller Optics, Inc. of Providence, Rhode Island.

Meller Sapphire and Ruby Balls are single crystal materials with zero porosity, that are chemically inert and extremely resistant to abrasion, heat, and high pressure. Featuring Mohs 9 hardness which is second only to diamond, they come in 42 inch and metric sizes from 0.1 mm to 0.5” dia. with 0.000025” sphericity and ±0.0001” basic diameter tolerance.

Suited for orifice applications up to 50,000 psi and numerous bearing applications, Meller Sapphire and Ruby Balls have a 2,000°C melting point, 0.2 coefficient-of-friction, and a refraction index of 1.76 microns at 20°C, and are non-magnetic. For optical applications, these balls can be drilled and precision ground into miniature plano-convex lenses.

Meller Sapphire and Ruby Balls are priced according to material, size, and quantity; delivered from stock. Samples are available upon request.