| Customization: | Available |
|---|---|
| Type: | Limit Gauge |
| Measurement Object: | Inside Diameter |
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Plug gauges come in several styles or configurations making them suitable for different uses. Plain plug gauges are used to check the dimensional tolerances on holes that are bored or drilled with smooth walls. There are also threaded plug gauges that are used to check threaded or tapped holes, and verify the proper thread type, major diameter, minor diameter, pitch diameter, and pitch of the thread against a mating thread gauge.
As with ring gauges, some plug gauges called master sets or master plugs are not used as working gauges but are instead employed to validate other measuring instruments such as bore gauges or external micrometers, for example, by providing a measurement standard or reference standard for calibration purposes. The practice is known as indirect gaging.
Other Plug gauge styles also include the following:
Plug gauges are typically fabricated using high-grade tool steel such as 52100. This choice provides both corrosion resistance due to the high chromium content of the steel and a reduction in friction during use, which helps to extend the life of the gauge.
Tungsten carbide gauges offer high wear resistance, some 50x that of tool steel. In addition, it is non-magnetic, somewhat resistant to corrosion, and will not burr. Tungsten carbide does, however, have a low coefficient of thermal expansion, and so more stringent temperature control is warranted when using tools of this material to gage steel parts of tight tolerance.
Chrome-plated plug gauges will also provide a harder surface and can be used for the gaging of abrasive materials such as magnesium or aluminum.
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