Imetra, Inc. provides precision balls in a variety of specialty materials manufactured to A.F.B.M.A. standards and specifications. Standard and custom sizes are available in Metric and English including modifications such as coating, drilled holes, and hemispheres. We provide only the highest quality precision balls to ensure superior performance for OEM, aftermarket and other applications.

Please contact us regarding custom needs for your application.

Standard and Custom Sizes

Standard size range available in metric from .12mm to 19.0mm.

Standard size range available in inches from 1/32” to 3/4”.


Imetra provides precision balls in grade 100 and below. A Grade 5 ball is spherically accurate within 5 millionths of an inch (0.000005″), Grade 25 is within 25 millionths (0.000025″).


Sapphire and Ruby

Synthetic Sapphire and Ruby, also known as Corundum, have the same chemical composition, crystal structure and properties of the natural gemstones. Synthetic Sapphire is 99.99% pure Al2O3 and is clear and colorless. Ruby contains a trace of chromium to produce its red color making it easier to see and handle. Defining properties include durability, hardness (measuring 9 on the Mohs scale), non-porosity, corrosion resistance and chemical resistance, has excellent insulating properties and high thermal conductivity. A very pure material, it has good wear resistance and dimensional stability. Having superior optical transmission qualities this material is excellent for use with visible light, infrared and ultraviolet transmission and is regularly used in optical equipment.

Cubic Zirconia

Cubic Zirconia (CZ) is the cubic crystalline form of zirconium dioxide (ZrO2). It is generally colorless and relatively hard (8 – 8.5 on the Mohs scale). It is lightweight, wear resistant, is high density, has good compressive strength and is corrosion resistant. A high refractive index makes it ideal for optical applications. Lenses can be used as aspheric or collimating. Chemical stability of Yttrium stabilized Cubic Zirconia (ZrO2 + Y2O3) makes it suitable for use in the chemical industry.


Balls manufactured from a variety of ceramic materials are extremely resistant to corrosion and abrasion. Ceramic Balls exhibit low thermal conductivity and resistance to extreme temperatures. Bearing friction is less likely to increase as temperature increases when using ceramics and heat absorption is considerably less than other materials allowing lower cooling requirements. These qualities make ceramic balls useful for flow control, metering and bearing applications in harsh environments.

Technical Glass and Optical Glass

Balls produced from glass manufactured by Schott, Ohara, CDGM and others offer many advantages. Glass balls are able to withstand and adapt to more extreme temperatures and can handle wet and corrosive environments without degrading. Optical transmission qualities include the ability to transmit a wide spectrum including visible light, infrared and ultraviolet.