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Anyone know the meaning of "gauge" when talking about the outer diameter of a door hinge's knuckle?

For example, commercial door hinge knuckles often have "gauge" sizes of 0.134 or 0.180.

Doing my own measurements, I'm guessing that in this context it means tenth-of-a-meter. E.g., 0.134 gauge = 13.4 mm.

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The gauge is a measure of the thickness of the hinge metal.

enter image description here
 source: Stanley 5 Knuckle Ball Bearing Hinges

This would affect the size of the knuckle as it wraps around the hinge pin.

size of knuckle = (hinge gauge x 2) + hinge pin diameter (+ a bit to allow for clearance)

Heavy weight gauges increase available bearing surface area. It will also determine the depth of the cut-out recess(es) in the door/door frame necessary for a flush installation.

The gauge also determines the type of 'hinge tweaker' tool you need.

   enter image description here
    Hinge Tweaker Heavy Weight Size for .180 Gauge Hinges

You need a more robust tool with a wider 'mouth' to 'tweak' .180 Gauge Hinges than .123 Gauge Hinges

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