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Calibration Disc

Designed to remove potential sources of measurement error, these Discs can be used to calibrate Norbar torque transducers, and torque transducers from other manufacturers (where design permits), as well as mechanical test devices. UKAS length certification is provided with each Disc. Note: A temperature controlled environment is essential for use of these beams. The selection of weights will be influenced by gravitational constant and air buoyancy values at the proposed laboratory site.

Part number: 21400
EAN Bar Code: -
NATO number: 6635-99-844-3520
Accuracy: +/- 0.025%
Operates between:
5.0 - 160.0 ozf·in
0.0 - 1.0 N·m


  • Torque Radius: 100 mm
  • Weight: 0.47 Kg
  • Square Sizes: 1/4"
  • Cable Radius: 0.30 mm
  • Beam Radius: 99.70 mm
  • Clearance: 1120 mm
  • Dimension X: 230 mm
  • Dimension Y: 30 mm


  • The <0.04% uncertainty of applied torque achievable with this disc allows calibration to the highest class of accuracy specified by BS7882:2008.
  • Clockwise and counter-clockwise operation.
  • Capable of SI or Imperial calibrations.
  • Compatible with male and female 1/4" square transducer drives.
  • No bearings to cause energy loss during loading.
  • Brass weights with an accuracy better than +/-0.01% are available in five sets to achieve a variety of calibration ranges.
  • Special weight sets can be specified up to a maximum torque of 2.5 N·m.
  • Machined to +/-0.03% from aircraft alloys.

Operators Handbook


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Norbar apps are available free for download on Android and iPhone and are invaluable tools for engineers.

Our Torque Unit Converter provides instant conversion across Metric, SI and Imperial units.

The Torque Extension app calculates the exact torque wrench setting value for required level of torque to be applied.

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Precision torque engineering is a wide and complex field which is critical to many sectors of industry and poses many questions to those seeking information about its features and practical applications.

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Use Our Calculators

Norbar has devised easy-to-use online calculators that support the correct application of torque in three key areas:

  1. Unit conversion to assist international measurement definitions.
  2. Torque extension for setting correct values
  3. Torque tension to identify precise levels of torque to be applied for individual applications.
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NORBAR TORQUE TOOLS LTD. Wildmere Road, Banbury, Oxfordshire, OX16 3JU, United Kingdom
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