Glossary Thread gauges

Thread gauges are used to quickly and easily check threads for compliance with permissible tolerances. Gauging” is not a measurement, so the result is not a numerical value, but only a classification of whether the workpiece is good or must be disposed of as scrap or reworked.

All relevant sizes are checked in one step using the thread gauge:

• The nominal diameter that corresponds to the outer diameter of a screw.
• The core diameter that corresponds to the inside diameter of a nut.
• The flank diameter, which corresponds to the distance between two opposing thread flanks measured perpendicular to the axis.
• The flank angle, which describes the angle formed by the thread flanks.
• The pitch is the distance between two thread flanks of the same direction.

Thread gauges include the

• Screw plug gauges
• Thread limit plug gauges
• Thread plug gauges
• Thread rejection plug gauges
• Thread ring gauges
• Thread scrap ring gauges

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