Wood & Self Tapping Screw Gauges

Screw Gauge Number vs Diameter

Use this chart to convert screw diameter to screw gauge number.

Screw Gauge Number	Diameter (inches)	Diameter (millimetres)
0	0.060	1.52
1	0.073	1.78
2	0.086	2.20
3	0.099	2.52
4	0.112	2.84
5	0.125	3.18
6	0.138	3.51
7	0.151	3.84
8	0.164	4.18
10	0.190	4.83
12	0.216	5.49
14	0.242	6.15
16	0.268	6.81