| |
SELECTION
FOR SERVICE CONDITION
|
SERVICE
CONDITION
|
STUDBOLTS
|
NUTS
|
WORKING
TEMPERATURE
|
|
High Pressure
High Temperature
|
ASTM
A193 Gr.
BV6
B7
B7M
B16
|
ASTM
A 194
6
2H
2HM
4 Or 7
|
0-480
C
50-450
50-450
|
|
High
Temperature
High Corrosive
|
ASTM
A 193 Gr. B8
B8M
B8T
|
ASTM
A 194 Gr.8
8M
8T
|
540-800
540-800
540-800
|
|
High
Pressure
Low Temperature
|
ASTM
A320 Gr.L7
|
ASTM
A 194 Gr4 or 7
|
100-50
|
|
Low
Temperature
|
ASTM
A320 Gr.B8
B8M
B8T
|
ASTM
A 194Gr.8
8M
8t
|
250-100
250-100
250-100
|
MECHANICAL
PROPERTIES
ASTM
/ SAE / STANDARDS
|
GRADES
|
STUD
BOLT- GRADES
|
NUT
-GRADES
|
|
|
B7
|
B7M
|
B6
|
B8
|
B8M
|
B8T
|
B16
|
L7
|
2H
|
2HM
|
G4
|
G7
|
G6
|
G8
|
8M
|
8T
|
|
UTS
KgS /mm2 (min)
|
87.9
|
70.3
|
77.3
|
52.7
|
52.7
|
52.7
|
87.9
|
87.9
|
|
|
|
|
|
|
|
|
|
Yield
Stress
Kg /mm2(min)
|
73.8
|
50.2
|
59.8
|
21.1
|
21.1
|
21.1
|
73.8
|
73.8
|
|
|
|
|
|
|
|
|
|
Elongation
%(min)
|
16
|
18
|
15
|
30
|
30
|
30
|
18
|
16
|
|
|
|
|
|
30
|
30
|
30
|
|
Reduction
Area %(min)
|
50
|
50
|
50
|
50
|
50
|
50
|
50
|
50
|
|
|
|
|
|
50
|
50
|
50
|
|
Hardness
|
|
99HRB
Max
|
|
95.5
HRB
Max
|
95.5
HRB
Max
|
95.5
HRB
Max
|
|
|
24-38
HRC
|
22
HRC
Max
|
24-38
HRC
|
24-38
HRC
|
20-38
HRC
|
60-105
HRC
|
60-105
HRC
|
60-105
HRC
|
IS
1367 Part III / LSO / DIN STANDARDS
|
Mechanical
Property
|
4.6
|
4.8
|
5.6
|
5.8
|
6.8
|
8.8
<16
|
8.8
>16
|
9.8
|
10.9
|
12.9
|
|
Tensile
strenght Rm N/mm2
|
Nom
|
400
|
400
|
400
|
400
|
600
|
800
|
800
|
900
|
1000
|
1200
|
|
Min
|
400
|
420
|
500
|
520
|
600
|
800
|
830
|
900
|
1040
|
1220
|
|
Yield
stress N/mm2
|
Min
|
240
|
320
|
300
|
400
|
480
|
|
|
|
|
|
|
Max
|
240
|
340
|
300
|
420
|
480
|
|
|
|
|
|
|
Elongation
%
|
Min
|
22
|
14
|
20
|
10
|
8
|
12
|
12
|
10
|
9
|
8
|
|
Brinell
Hardness
|
Min
|
114
|
124
|
147
|
152
|
181
|
219
|
242
|
266
|
295
|
353
|
|
Max
|
|
209
|
|
|
238
|
285
|
319
|
342
|
362
|
412
|
|
Rock
well Hardness HRC
|
Min
|
|
|
|
|
|
22
|
23
|
27
|
32
|
39
|
|
Max
|
|
|
|
|
|
32
|
34
|
36
|
39
|
44
|
CHEMICAL
REQUIREMENTS
ASTM
/ SAE STANDARDS
|
Grades
|
Material
|
Carbon
|
Manganese
|
Phosphorus
|
Sulphur
|
Silicon
|
Chromium
|
Nickel
|
Molybdenum
|
Titanium |
Vanadium |
|
|
|
%
|
%
|
%
|
%
|
%
|
%
|
%
|
%
|
%
|
%
|
|
2.2HM
&2H
|
Carbon
|
0.40min
|
1.00max
|
0.040max
|
0.050max
|
0.40max
|
|
|
|
|
|
|
4
|
Carbonmoly
- bdenum
|
0.04-0.50
|
0.70-0.90
|
0.035max
|
0.040max
|
0.15-0.35
|
|
|
0.20-0.30
|
|
|
|
6
|
AISI
410
|
0.15max
|
1.00max
|
0.040max
|
0.030max
|
1.00max
|
11.50-
13.50
|
|
|
|
|
|
B
7
B 7M
|
AISI
4140
4142/
4145
4140H
4142H
4145H
|
0.37-0.49
|
0.65
|
0.04max
|
0.04max
|
0.15-
0.35
|
0.75-
1.20max
|
|
0.15-
0.25
|
|
|
|
B8/B8A
|
AISI304
|
0.08max
|
2.00max
|
0.045max
|
0.030max
|
1.00max
|
18.00-
20.00
|
8.00-10.50
|
<
|
|
|
|
B8M/8MA
|
AISI316
|
0.08max
|
2.00max
|
0.045max
|
0.030max
|
1.00max
|
16.00-
18.00
|
10.00-
14.00
|
2.00-
3.00
|
|
|
|
B8T/
B8TA
|
AISI321
|
0.08max
|
2.00max
|
0.045max
|
0.030max
|
1.00max
|
17.00-
19.00
|
9.00-
12.00
|
|
5*Carbon
content min |
|
|
B16
|
|
0.36-
0.44
|
0.45-
0.70
|
0.035max
|
0.040max
|
0.15-
0.35
|
0.8.-
1.15
|
|
0.50-
0.65
|
|
0.25-
0.35 |
|
L7
|
|
0.38-
0.48
|
0.75-
1.00
|
0.035max
|
0.040max
|
0.15-
0.35
|
0.80--
1.10
|
|
0.15-
0.25
|
|
|
IS
/ISO/ DIN STANDARDS
|
Grades
|
Material
|
|
Min
|
Carbon
|
Manganese
|
Phosphorus
|
Sulphur
|
Silicon
|
Chromium
|
Nickel
|
Molybdenum
|
|
Min
|
|
|
|
|
|
|
|
|
|
Max
|
0.23
|
1.5
|
0.050
|
0.050
|
|
|
|
|
|
Min
|
0.35
|
0.60
|
|
|
0.05
|
|
|
|
|
Max
|
0.45
|
1.00
|
0.060
|
0.06
|
0.35
|
|
|
|
|
Min
|
0.35
|
0.50
|
|
|
0.10
|
0.90
|
|
0.20
|
|
Max
|
0.45
|
0.80
|
|
|
0.35
|
1.50
|
|
0.40
|
|
Min
|
0.35
|
0.45
|
|
|
0.10
|
0.90
|
1.30
|
0.20
|
|
Max
|
0.45
|
0.70
|
|
|
0.35
|
1.40
|
1.80
|
0.35
|
|
|
4.6
4.8
|
En-3B
IS-2062
|
|
5.6
5.8
6.8/8.8
|
En-8
En-9
|
|
9.8
10.9
|
En-19
|
|
12.9
|
En-24
|
COMPARSION
OF DIFFERENT STRENGTH GRADES
|
SAE
|
B.S.
|
I.S.
I.S.O.
DIN
|
ULTIMATE
TENSILE STRENGTH
|
HARDNESS
|
|
Tonnes/in2
(Kgf/mm2)
|
Newtons/mm2
Min
(Kgf/mm2)
|
pounds/in3
Min
(Kgf/mm2)
|
BHN
|
HRb
|
HRc
|
|
|
|
4.6
|
|
400
(40.8)
|
|
114
209
|
67
95
|
|
|
GRADE
1
|
|
|
|
|
60,000
(42.3)
|
(121)
(241)
|
70
100
|
|
|
|
|
4.8
|
|
420
(42.8)
|
|
124
209
|
71
95
|
|
|
|
|
5.6
|
|
500
(51.0)
|
|
147
209
|
79
95
|
|
|
GRADE
2
|
|
|
|
|
74,000
(52.1)
|
(154)
(241)
|
80
100
|
|
|
|
|
5.8
|
|
520
(53.0)
|
|
152
209
|
82
95
|
|
|
|
P
|
|
35/45
(55.2/71.0)
|
|
|
152
207
|
|
|
|
|
|
6.8
|
|
600
(61.2)
|
|
181
238
|
89
99
|
|
|
|
R
|
|
45/55
(71.0/86.8)
|
|
|
201
285
|
|
|
|
|
S
|
|
50/60
(78.9/94.7)
|
|
|
223
310
|
|
(20/33)
|
|
|
|
8.8
|
|
800<M16
830>M16
(81.6)
(84.6)
|
|
219/285
242/319
|
|
20/30
23/34
|
|
GRADE
5
|
|
|
|
|
1,20,000
(84.6)
|
(266)
(318)
|
|
25/34
|
|
|
T
|
|
55/65
(86.8/102.6)
|
|
|
248
335
|
|
(24/36)
|
|
|
U
|
|
60/70
(94.7/110.5)
|
|
|
269
331
|
|
(28/36)
|
|
|
V
|
|
65/75
(102.6/118.4)
|
|
|
293
370
|
|
(31/40)
|
|
GRADE
8
|
|
|
|
|
1,50,000
(105.7)
|
(311)
(362)
|
|
33/39
|
|
|
|
10.9
|
|
1,040
(106.0)
|
|
295
362
|
|
31/39
|
|
|
W
|
|
70/80
(110.5/126.3)
|
|
|
311
375
|
|
(33/41)
|
|
|
X
|
|
75/85
(118.4/134.2)
|
|
|
341
410
|
|
(37/44)
|
|
|
|
12.9
|
|
1,220
(124.4)
|
|
353
412
|
|
38/44
|
|
|
Y
|
|
|
80/90
126.3/142.0)
|
|
363
429
|
|
(39/46)
|
|
|
Z
|
|
|
100Min.
(157.8)
|
|
444
|
|
(47)
|
|