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Tapping Screw Gauge to Metric Size

The nominal diameter of a self tapping screw can be identified in metric mm or imperial gauge size.

For example a No.6 gauge self tapping screw is also a 2.5mm self tapping screw. The nominal diameter can be measured across the threaded portion of the tapping screw.

The accompanying table shows imperial gauge diameters and their metric equivalent.


Self tapping screw nominal diameter comparison

For more detailed information please view the following pages:

Square Drive Pan Tapping Screw Standard
Square Drive Csk Tapping Screw Standard
View all available Self Tapping Screws

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