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UDS universal datum sphere

The universal datum sphere enhances the use of both manual and automated CMMs

Universal datum sphere (UDS)

It allows for quick and easy adjustment to set ball stem over a wide range of probe datuming angles. Allowing for datuming above, centrally and below the ball.

The spheres are made from hard-wearing tungsten carbide and are available in five different diameters:

  • 12 mm
  • 19 mm
  • 25 mm
  • 3/4 in
  • 1 in

Each sphere kit comprises:

  • One datum sphere
  • Pivot pillar, base, 'C' spanner
  • Ball certificate and storage box
  • Adaptor for twin ball applications (optional)


Datum sphere



Hard wearing tungsten carbide sphere (ball) available in five sizes


Ø12 mm, Ø19 mm, Ø25 mm


Ø3/4 in and Ø1 in


To within 0.1 µm (0.000004 in)

Diametric tolerance

±1 µm (0.00004 in)

Part number
Datum ball kits
Datum ball kit - Ø12 mmA-1034-0028
Datum ball kit - Ø19 mmA-1034-0027
Datum ball kit - Ø25 mmA-1034-0026
Datum ball kit - Ø3/4 "A-1034-0031
Datum ball kit - Ø1 "A-1034-0035
Datum ball accessories
Datum ball fixing studs - M6 × 1M-1034-0016
Datum ball fixing studs - M8 × 1.25M-1034-0015
Datum ball fixing studs - M10 × 1.5M-1034-0014
Datum ball fixing studs - 5/16 " × UNCM-1034-0018
Datum ball fixing studs - 3/8 " × UNCM-1034-0017
Datum balls - Ø12 mm datum ballA-1034-0005
Datum balls - Ø19 mm datum ballA-1034-0023
Datum balls - Ø25 mm datum ballA-1034-0002
Datum balls - Ø3/4 " datum ballA-1034-0032
Datum balls - Ø1 " datum ballA-1034-0036
Datum ball 2-way adaptorM-1034-0042
Datum ball 3-way adaptorM-1034-0052
Datum ball pillar extension 75 mm longM-1034-0019