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What Is a Screw Gauge

Updated: Jun 9

Screw gauge refers to the diameter of the shank on a screw. It's measured using an imperial system that ranks the size with a number from 1 to 20. The higher the gauge, the bigger the screw.

The table below shows how imperial gauge sizes relate to metric screw sizes and gives the clearance and pilot hole sizes needed for each gauge size:  


GAUGE

CLEARANCE HOLE

PILOT HOLE

Imperial

Metric

 

 

2

2mm

2.5mm

1.6mm

3

2.5mm

3mm

1.6mm

4

3mm

3.5mm

2mm

6

3.5mm

4mm

2mm

8

4mm

5mm

2.5mm

10

5mm

5.75mm

3.5mm

12

5.5mm

6.5mm

3.5mm

14

6.5mm

6.5mm

4mm


 
 
 

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