plug gauge

(redirected from plug gauges)

plug gauge

n
(General Engineering) engineering an accurately machined plug used for checking the diameter of a hole. Compare ring gauge
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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Caption: Plug gauges are used to measure revolver chamber mouths.
All measurements can be taken with automotive-type spark plug gauges or similar with the cylinder closed.
While on the subject of measuring tools, to check cylinder chamber mouths I bought a set of plug gauges from machine a tool supply outfit called ENCO.
Cerulean and Micro-Epsilon are examining other potential applications for the instrument including measuring the dimensions of wires, rods, plug gauges and tubes.
A set of plug gauges showed the 4" version had .358" chamber mouths; a .359" plug would fit in none of the six.
Now I keep a record of the chamber throats (much easier to measure using plug gauges) and size bullets accordingly.
Several years ago I purchased a set of steel plug gauges measuring from .250" to .500" in increments of .001" and they have turned out to be one of the most important tools on my reloading bench.