obsolete American
wood screw gauges

Gauge
number
(1)
Diameter
(inches)
0 0.056
1 0.069
2 0.082
3 0.096
4 0.109
5 0.122
6 0.135
7 0.149
8 0.162
9 0.175
10 0.188
11 0.201
12 0.215
13 0.228
14 0.241
15 0.255
16 0.268
17 0.281
18 0.293
19 0.308
20 0.321
21 0.334
22 0.347
23 0.361
24 0.374
25 0.387
26 0.401
27 0.414
28 0.427
29 0.440
30 0.453

1. The equation relating the gauge number to the root diameter was An equation. Gauge equals the fraction whose denominator is point zero one three two five, and whose numerator is the diameter minus point zero five six

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