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Gage Length

Gage length is the strain sensitive length of the strain gage, as illustrated on the left.

Gage length ranges from 0.2 mm to 100 mm (0.008 in - 4 in), but a length of 3 mm to 6 mm (0.125 in - 0.25 in) is generally recommended for the common applications.

  • Select a shorter gage (3mm; 0.125 in), if
  - Very little space is available for mounting the gage.
  - A localized strain gradient needs to be measured. For example,if the strain that needs to be measured is close to or on a fillet, hole, or notch with a small diameter (< 25 mm; 1 in).
  - Accuracy is not critical.
  • Select a longer gage (6mm; 0.25 in), if
  - Installation speed is important. Longer gages are easier to handle and install.
  - Heat dissipation is an issue (usually on non-metallic materials), such as in a high temperature environment or under cycling stresses. A longer gage is less sensitive to the effects of heat.
  - The object to be measured has non-homogeneous material properties, such as concrete. A gage with a length two times or more than the non-homogeneities is needed to avoid local fluctuation.
  - Cost is an issue. Gages with length of 5.0 - 12.5 mm (0.2 - 0.5 in) are usually less expensive than other lengths.
Metal 3D Printing Design Guide

Direct Metal Laser Sintering (DMLS) 3D printing for parts with reduced cost and little waste.

CNC Machining Design Guide

Optimize your designs, reduce machining time, and lower your costs.

STEM Career Outlook

Wages, employment opportunities, and growth projections for STEM jobs.

Salary Expectation

8 things to know about the interview question "What's your salary expectation"?