Compagnie des chemins de fer de Paris à Lyon et à la Méditerranée (PLM)

screw thread series

Around 1875. Thread angle about 36°52″ with 1/8 rounding.

Diameter
in mm
Pitch
in mm
5 1.0
6 1.0
7 1.0
7 1.5
8 1.5
10 1.5
12 1.5
15 2.0
18 2.0
20 2.0
23 2.5
25 3.0
28 3.0
30 3.0
32 3.0
35 3.5
38 3.5
40 4.0
45 4.0
50 4.0
55 4.0

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