Radius gauge

A radius gauge, also known as a fillet gauge,[1] is a tool used to measure the radius of an object.[2]

Two types of radius gauges

Radius gauges require a bright light behind the object to be measured. The gauge is placed against the edge to be checked and any light leakage between the blade and edge indicates a mismatch that requires correction.[3]

A good set of gauges will offer both convex and concave sections, and allow for their application in awkward locations.

Every leaf has a different radius. The material of the leaves is stainless steel. It is of two types: 1. Internal 2. External. It is used to check the radius of inner and outer surfaces.



  1. Frane 1994, p. 128.
  2. Frane 1994, p. 281.
  3. Kennedy, Hoffman & Bond 1987, p. 233.


  • Frane, James T. (1994), Craftsman's Illustrated Dictionary of Construction Terms (Illustrated ed.), Craftsman Book Company, ISBN 978-1-57218-008-6.
  • Kennedy, Clifford W.; Hoffman, Edward G.; Bond, Steven D. (1987), Inspection and Gaging (6th, Illustrated ed.), Industrial Press Inc., ISBN 978-0-8311-1149-6.
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