Nail Sizes
Penny Size	Described Length (Inches)
2d-pronounced "2 Penny"	1
3d	11/4
4d	11/2
5d	13/4
6d	2
7d	21/4
8d	21/2
9d	23/4
10d	3
12d	31/4
16d	31/2
20d	4
30d	41/2
40d	5
50d	51/2
60d	6
70d	7
80d	8
Nail Gauge	Decimal Equivalent	Nearest Inch
51/2	0.200	13/64"
7	0.177	11/64"
9	0.1483	5/32"
10	0.135	9/64"
11	0.1205	1/8"
111/2	0.115	7/64" +
12	0.1055	7/64" --
121/2	0.099	3/32" +
13	0.0915	3/32" --
14	0.080	5/64" +
141/2	0.076	5/64" --
161/2	0.058	1/16"