Armengaud

screw thread series

V-thread, originally with a 76° angle. Later production switched to the 55° Whitworth thread form, at the request of Huguenin, Ducommun and Dubiet. 

Diameter
in mm
Pitch
in mm
5.0 1.4
7.5 1.6
10.0 1.8
12.5 2.0
15.0 2.2
17.5 2.4
20.0 2.6
22.5 2.8
25.0 3.0
30.0 3.4
35.0 3.8
40.0 4.2
45.0 4.6
50.0 5.0
55.0 5.4
60.0 5.8
65.0 6.2
70.0 6.6
75.0 7.0
80.0 7.4

Diameter and pitch data contributed by Job Visser, who suggested this entry.

Charles Eugène Armengaud.
Le vignole des mécaniciens. Études sur la construction des machines. Types et proportions des organes qui composent les moteurs, les transmissions de mouvement et autres mécanismes. 3rd ed.
Paris: E. Bernard & Cie, 1897.
Page 33.

 

Between about 1857 – 1900 Armengaud also made a square thread series:

Diameter
in mm
Pitch
in mm
20 3.80
25 4.25
30 4.70
35 5.15
40 5.60
45 6.05
50 6.50
55 6.95
60 7.40
65 7.85
70 8.30
75 8.75
80 9.20
85 9.65
90 10.10
95 10.55
100 11.00
105 11.45
110 11.90
115 12.35
120 12.80

Diameter and pitch data contributed by Job Visser.

Joseph Claudel.
Formules, tables et renseignements usuels; aide-mémoire des ingénieurs, des architectes, etc. : Partie pratique 5th edition.
Paris: Daimond et Dunod, 1860.
Page 329.

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