GRADOS Y MARCAS
ESPECIFICACION
1/4"
5/16"
3/8"
7/16"
1/2"
9/16"
5/8"
3/4"
7/8"
1"
1.1./8"
1.1/4"
1.3/8"
1.1/2"
lbs/pie
kg/m
lbs/pie
kg/m
lbs/pie
kg/m
lbs/pie
kg/m
lbs/pie
kg/m
lbs/pie
kg/m
lbs/pie
kg/m
lbs/pie
kgm/m
lbs/pie
kg/m
lbs/pie
kg/m
lbs/pie
kg/m
lbs/pie
kg/m
lbs/pie
kg/m
lbs/pie
kg/m
ASTM-A307
GRADO A
6
0.83
11
1.52
..19
2.63
30
4.15
45
6.22
66
9.12
93
12.86
150
20.75
202
27.90
300
41.50
474
65.60
659
91.10
884
122.30
1057
146.20
ASTM-A449
TIPO 1
9
1.24
18
2.48
31
4.30
50
6.90
75
10.37
110
15.21
150
20.75
250
34.58
378
52.30
583
80.60
782
108.20
1097
151.70
1461
202.10
1748
241.70
ASTM-A354
GRADO BD
13
1.80
28
3.87
46
6.36
75
10.37
115
15.90
165
22.82
225
31.12
370
51.17
591
81.70
893
123.50
1410
195.00
1964
271.60
2633
364.10
3150
435.60
ASTM-A325
NOTA 1
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100
13.83
-----
----
200
27.66
355
49.10
525
72.60
790
109.30
1060
146.60
1495
206.80
1960
271.10
2500
359.60
ASTM-A490..
NOTA 1
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55
55
-----
90
12.45
138
19.08
198
27.38
270
37.34
444
61.40
709
98.10
1071
148.10
1692
234.00
3264
326.40
3159
436.90
3780
522.80
ANSI B18.6.3
SAE J 478
75
lbs/pul
0.86
140
lbs/pul
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ASTMA-574
14
1.93
30
50
50
6.90
81
11.18
121
16.70
176
24.29
240
33.12
395
54.51
629
86.90
964
133.00
1523
210.10
2120
292.50
2843
392.30
3402
469.47
NOTA 1: ESPECIFICACIONES DE TORQUE VALEN PARA SUJECION PERMANENTE EN ESTRUCTURAS DE ACERO
Fuente: Depto. Ingeniería American Screw de Chile S.A.