Product Details

A sine bar is used in conjunction with slip gauge blocks for precise angular measurement. A sine bar is used either to measure an angle very accurately or face locate any work to a given angle offering a high degree of accuracy in measuring angles for milling, grinding and inspection applications.

The sine bar forms the hypotenuse of a right angle triangle, while the slip gauge blocks form the opposite side.  The height of the slip gauge block is found by multiplying the sine of the desired angle by the length of the sine bar:  H = L * sin(θ).

Opus Precision Sine bars are carefully manufactured from specially selected steel to the accuracy requirements of  BS 3064:1978 – Type 2

Sizes available 100mm 200mm and 300mm

Every bar is made from high quality tool steel which is hardened to 62 Rc (750 Hv approximately), stress relieved and then stabilised.

Supplied complete with a UKAS Calibration Certificate Free of Charge

FEATURESpecification Tolerances for Bar Size
Distance Between Roller Axes0.002 5mm0.005mm0.008mm
Equality of Mean Diameter of Rollers0.002 5mm0.002 5mm0.002 5mm
Co-planarity of Roller Axes0.002mm0.002mm0.002mm
Flatness of Upper Working Surface0.001 5mm0.002mm0.003mm
Parallelsim of Upper Working Surface to Lower Surface of Rollers0.002mm0.002mm0.002mm
Flatness of End and Side Fences (When Attached)

  • Available Sizes (Roller Distance) 100mm, 200mm & 300mm
  • Manufactured to: BS3064:1978 - Type 2
  • Material: Hardened Tool Steel
  • Supplied With a UKAS Calibration Certificate
  • Manufactured in the UK by Opus Metrology

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Contact Details


Phone: +44(0) 1536 204681
Fax: +44(0) 1536 205272

Unit 15 Maylan Road
Earlstrees Industrial Estate
NN17 4DR
Opening Times

Monday: 08:00 - 17:00
Tuesday: 08:00 - 17:00
Wednesday: 08:00 - 17:00
Thursday: 08:00 - 17:00
Friday: 08:00 - 13:00
Saturday: Closed
Sunday: Closed