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Screw Measuring Information

The measuring guides below explain how to measure a screw gauge, thread, threads per inch and how to measure the overall length of a screw.

Screw Gauge

The gauge of the screw is determined by the thread diameter.

Screw Gauge Pic

Screw Gauge Conversion Table

Screw Thread Length

Below shows how to work out the thread length.

Screw Thread Length

Screw Measuring Lengths

Fasteners with the following Head Types are measured from the underside of the head to the point of the screw:

Screw Measuring Lengths pic1

Measurement to the point of the screw

Fasteners with the following head types are measured from the top of the head to the point of the screw:

Screw Measuring pic2

Measurement to the point of the screw

 

 

Size Conversion Table

 The table shows the closest conversion value from imperial to metric.

Size Conversion Chart

 

Screw Threads Per Inch (TPI)

 The TPI is the number of thread crests that can be counted within 1” (25.4mm).

Screw Teeth Per Inch (TPI)

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