Common Nails With Different Lengths and Wire Gauges

A diagram picture of common nails with different sizes.

Nail size is called a "penny", e.g. "a 6-penny nail". And now penny size is simply denoted by the letter "d". The following table is the length of each number.

Penny Size Length
in. mm
2d 1 25.4
3d 1-1/4 31.7
4d 1-1/2 38.1
5d 1-3/4 44.4
6d 2 50.8
7d 2-1/4 57.1
8d 2-1/2 63.5
9d 2-3/4 69.8
10d 3 76.2
12d 3-1/4 82.5
16d 3-1/2 88.9
20d 4 101.6
30d 4-1/2 114.3
40d 5 127.0
50d 5-1/2 139.7
60d 6 152.4
70d 7 177.8
Steel Wire Gauge DiameterGauge
in. mm
3 0.259 6.57
4 0.238 6.05
6 0.203 5.16
8 0.162 4.12
9 0.148 3.76
10 0.131 3.33
11 0.120 3.05
12 0.113 2.85
13 0.092 2.34
14 0.083 2.11
15 0.072 1.83
16 0.065 1.65
18 0.049 1.25
23 0.026 0.66
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