INTRODUCCIÓN
Tabla 1-2.
Serie de pulgadas con roscas gruesas (UNC) — Con recubrimiento de zinc
Designación de serie, roscas
por pulgadas y tamaño nominal
1/4-20 UNC
5/16-18 UNC
3/8-16 UNC
7/16-14 UNC
1/2-13 UNC
9/16-12 UNC
5/8-11 UNC
3/4-10 UNC
7/8-9 UNC
1-8 UNC
1 1/8-7 UNC
1 1/4-7 UNC
1 3/8-6 UNC
1 1/2-6 UNC
1-10
Par de apriete (pie/lb)
Grado
Máximo
5
6.6
8
9.3
5
13.5
8
19.1
5
24.0
8
33.9
5
38.4
8
54.3
5
58.6
8
82.8
5
84.5
8
119.4
5
116.6
8
164.8
5
206.8
8
292.3
5
333.8
8
471.6
5
500.3
8
707.0
5
624.0
8
1001.4
5
880.5
8
1413.1
5
1154.5
8
1852.8
5
1532.0
8
2458.8
Published 1-21-2018 Control # 655-01
MANUAL DE SERVICIO DE LA NBT40-1
Nominal
Mínimo
6.4
6.2
9.0
8.8
13.2
12.8
18.6
18.1
23.4
22.8
33.1
32.2
37.4
36.5
52.9
51.5
57.1
55.7
80.7
78.6
82.4
80.3
116.5
113.5
113.7
110.8
160.7
156.6
201.7
196.5
284.9
277.6
325.4
317.1
459.8
448.0
487.8
475.3
689.3
671.6
608.4
592.8
976.4
951.4
858.5
836.5
1377.8
1342.5
1125.6
1096.7
1806.5
1760.2
1493.7
1455.4
2397.3
2335.8