French wire gauges

At a minimum, these gauges were used for wire nails in the 19th and early 20th centuries.

Jauge de Paris
Gauge Diameter
in millimeters
P15 0.15
P14 0.16
P13 0.17
P12 0.18
P11 0.20
P10 0.22
P9 0.23
P8 0.25
P7 0.27
P6 0.28
P5 0.30 (Some say 0.3100)
P4 0.34
P3 0.37 (Some say 0.3810)
P2 or PP 0.42
P1 0.46
P0 or P 0.50
1 0.60
2 0.70
3 0.80
4 0.90
5 1.00
6 1.10
7 1.20
8 1.30
9 1.40
10 1.5
11 1.6
12 1.8
13 2.0
14 2.2
15 2.4
16 2.7
17 3.0
18 3.4
19 3.9
20 4.4
21 4.9
22 5.4
23 5.9
24 6.4
25 7.0
26 7.6
27 8.2
28 8.8
29 9.4
30 10.0

 

Jauge Japy
Gauge Diameter
in millimeters
10 1.45
11 1.60
12 1.75
13 1.90
14 2.05
15 2.2
16 2.4
17 2.7
18 3.0
19 3.5
20 4.0
21 4.6
22 5.2
23 5.9
24 6.6
25 7.3
26 8.0
27 8.7
28 9.4
29 10.0
30 10.5
31 11.0
32 11.5
33 12.5
34 13.5
35 14.5
36 15.5
37 16.5
38 17.5
39 18.5
40 19.5
41 20.5
42 21.5
43 22.5
44 23.5

Source: Hardware Tables, Formulae and Recipes... 6th edition. London: The Ironmonger, 1924. Pages 3 and 63, which differ.

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Last revised: 8 November 2005.