DESCRIPTION: A sine bar consists of a hardened, precision ground body with two precision ground cylinders fixed at the ends. The distance between the centers of the cylinders is precisely controlled, and the top of the bar is parallel to a line through the centers of the two rollers.

Angles are measured using a sine bar with the help of gauge blocks and a dial gauge or a spirit level. The aim of a measurement is to measure the surface on which the dial gauge or spirit level is placed horizontally. For example, to measure the angle of a wedge, the wedge is placed on a horizontal table. The sine bar is placed over the inclined surface of the wedge. At this position, the top surface of the sine bar is inclined the same amount as the wedge. Using gauge blocks, the top surface is made horizontal. The sine of the angle of inclination of the wedge is the ratio of the height of the gauge blocks used and the distance between the centers of the cylinder.


  • Superior quality
  • Flexible design
  • High grade material and advance technology is used in the manufacturing of Sine Bar


  • Range: 100 mm, 150 mm, 208 mm, 250 mm & 300 mm
  • For the inspection angle chocking and taper checking
  • Hardness: 60 ±2 hr
  • Working face accuracy 0.00003″/ per inch. |
  • Rolls center distance accuracy 0.0002″.
  • For angles set up by using Sine Bar with 1-2-3 Blocks or Gage Block.
  • Parallelism: 0.0004″.
  • Flange on the end for the resting of work piece.
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