Product Tips

 

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)