Parafusos Sextavados ASTM-A307 Grau A


* Marcação do grau  
REFERÊNCIA:
ANSI B18.2.1-1981
TABELA 2
Diâmetro
Nominal
E
F
G
H
R
LT
L<ou =6"L>6"
máx.
máx.
min.
máx.
min
máx.
min.
máx.
min.
básico
básico
1/4"
6,604
11,125
10,795
12,827
12,293
4,775
3,810
0,762
0,254
19,050
25,400
5/16"
8,299
12,700
12,293
14,655
14,020
5,969
4,953
0,762
0,254
22,225
28,575
3/8"
9,855
14,274
13,817
16,510
15,748
6,807
5,740
0,762
0,254
25,400
31,750
7/16"
11,480
15,875
15,316
18,338
17,449
8,026
6,908
0,762
0,254
28,575
34,925
1/2"
13,081
19,050
18,415
21,996
20,980
9,245
7,670
0,762
0,254
31,750
38,100
5/8"
16,306
23,812
23,012
27,508
26,238
11,277
9,601
1,524
0,508
38,100
44,450
3/4"
19,507
28,575
27,635
32,994
31,496
13,309
11,557
1,524
0,508
44,450
50,800
7/8"
22,733
33,324
32,232
38,506
36,753
15,341
13,487
1,524
0,508
50,800
57,150
1"
25,958
38,100
36,830
43,992
41,986
17,780
15,011
2,286
0,762
57,150
63,500
1.1/8"
29,184
42,875
41,427
49,504
47,218
19,812
16,713
2,286
0,762
63,500
69,850
1.1/4"
32,435
47,625
46,024
54,991
52,476
22,250
19,024
2,286
0,762
69,850
76,200
1.3/8"
35,661
52,374
50,647
60,502
57,734
23,876
20,574
2,286
0,762
76,200
82,550
1.1/2"
38,887
57,150
55,245
65,989
62,992
26,314
22,910
2,286
0,762
82,550
88,900
1.3/4"
45,339
66,675
64,465
76,987
73,482
30,378
26,771
3,048
1,016
95,250
101,600
2"
51,790
76,200
73,660
87,985
83,972
35,255
29,845
3,048
1,016
107,950
114,300
2.1/4"
58,547
85,725
82,854
98,983
94,462
39,319
33,705
4,826
1,524
120,650
127,000
2.1/2"
64,998
95,250
92,075
109,982
104,978
43,383
37,566
4,826
1,524
133,350
139,700
2.3/4"
71,805
104,775
101,295
120,980
115,468
47,472
41,452
4,826
1,524
146,050
152,400
3"
78,257
114,300
110,490
131,978
125,958
52,324
46,101
4,826
1,524
158,750
165,100
3.1/4"
84,709
123,825
119,684
142,976
136,448
57,175
49,174
4,826
1,524
171,450
177,800
3.1/2"
91,160
133,350
128,905
153,974
146,964
60,452
52,247
4,826
1,524
184,150
190,500
3.3/4"
97,993
142,875
138,099
164,973
157,429
65,328
56,921
4,826
1,524
196,850
203,200
4"
104,419
152,400
147,320
175,971
167,944
70,205
61,569
4,826
1,524
209,550
215,900

 

TOLERÂNCIA PARA COMPRIMENTOS "L"
Diâmetro Nominal
Comprimento
Nominal
1/4" a 3/8"
7/16" e 1/2"
9/16"a 3/4"
7/8" e 1"
1.1/8" a 1.1/2"
Acima de 1.1/2"
Até1"
+0,508
-0,762
+0,508
-0,762
+0,508
-0,762
---------
---------
---------
Acima de
1"até 2.1/2"
+0,508
-1,016
+1,016
-1,524
+1,524
-2,032
+2,032
-2,540
+3,048
-3,048
+4,572
-4,572
Acima de
2.1/2"até 4"
+1,016
-1,524
+1,524
-2,032
+2,032
-2,540
+2,540
-3,556
+4,064
-4,064
+5,080
-5,080
Acima de
4" até 6"
+1,524
-2,540
+2,032
-2,540
+2,540
-2,540
+3,048
-4,064
+4,572
-4,572
+5,588
-5,588
Acima de 6"
+2,540
-4,572
+3,048
-4,572
+3,556
-4,572
+4,064
-5,080
+5,588
-5,588
+6,096
-6,096

 

Podem ser fornecidos nos seguintes tratamentos superficiais:

Parafuso sextavado ASTM A307Zincado Eletrolitico (ZB Zincado Branco).

Parafuso sextavado ASTM A307 Zincado Eletrolitico Amarelo (BC Bicromatizado).

Parafuso sextavado ASTM A307 Enegrecido de Têmpera (PO)

Parafuso sextavado ASTM A307 Galvanizado a Fogo (GF).

Parafuso sextavado ASTM A307 Cadmiado (CAD).

Parafuso sextavado ASTM A307 Fosfatizado (FOSF)

Parafuso sextavado ASTM A307 Zincado Preto (ZP)

Parafuso sextavado ASTM A307 Organo Metalico (OM) "Ruspert, Ecosil, Duracil, Dacromet, Geomet.."

VERIFICAR A TABELA DE COMPOSIÇÃO QUÍMICA DOS PARAFUSOS

OBS: ROSCAS: Quando não especificado, usar - UNC-2A, para todos os diâmetros.