Precision Balls

Calibrated precision balls are used in a wide range of applications including in the measurement of small internal tapers, internal annular grooves and throated worm wheels.

Each standard set of balls contains a range of sizes, with three matched balls per size.  The main features of Opus precision balls are as follows:


  • Manufactured from High Carbon Chrome Steel (AISI 52100-EN31)
  • Available in metric and inch sizes
  • Metric range 1 to 25mm or 1.5 to 12.5mm each in 1mm steps
  • Inch range 1/16 to 1/2 inch in 1/32inch steps or 9/16 to 1inch in 1/16inch steps
  • Special combination sets available
  • Individual sizes available
  • Different materials available


All Opus balls can be supplied with UKAS (United Kingdom Accreditation Service) calibration certificate, please ask for details.

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