How to Use a Radius Gauge

Written by bob white
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A radius gauge or fillet gauge is a tool used to measure the radius of a curve. These tools are used for welding and light engineering work. They are typically designed to measure a radius of less than 150 degrees. There are several different styles of gauges, depending on the application and the manufacturer. A quality tool will measure both concave and convex sections.

Skill level:


  1. 1

    Hold the gauge perpendicular to the curved object for which you need to know the radius.

  2. 2

    Press the centre of the gauge to the object and adjust the gauge so that the two arms touch the curve without moving the centre point from the surface.

  3. 3

    Read the gauge's degree indicator located near the handle.

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