Standard: ASTM A193 B7—ASTM A194 2H
                   ASTM A193 B7M—ASTM A194 2HM
                   ASTM A320 L7—ASTM A194 GR.7
                   ASTM A320 L7M—ASTM A194 GR7M

MATERIAL: 1040,1045,4140,4142
Surface protection: Plain, Hot dip galvanized, Galvanization, Dacroment, Xylan .
Packing: Standard packing or According to customers' requirements
According to customers' Drawings and/or samples

 

Scope
Originally approved in 1936, this specification is heavily utilized in petroleum and chemical construction applications.  The ASTM standard covers alloy steel and stainless steel bolting materials for high temperature or high pressure service. This specification includes fasteners intended for use in pressure vessels, valves, flanges, and fittings. Although, this material is often available in national coarse (UNC) thread pitches, if being used in traditional applications, threads are specified 8 threads per inch (tpi) for diameters above one inch.
Below is a basic summary of a few of the common grades. ASTM A193 covers a number of other standard specifications not covered in this description including B5, B6, and B16.
Grades
B7
Alloy steel, AISI 4140/4142 quenched and tempered
B8
Class 1 Stainless steel, AISI 304, carbide solution treated.
B8M
Class 1 Stainless steel, AISI 316, carbide solution treated.
B8
Class 2 Stainless steel, AISI 304, carbide solution treated, strain hardened
B8M
Class 2 Stainless steel, AISI 316, carbide solution treated, strain hardened
Mechanical Properties
Grade
Size
Tensile ksi, min
Yield, ksi, min
Elong, %, min
RA % min
B7
Up to 2-1/2
125
105
16
50
2-5/8 - 4
115
95
16
50
4-1/8 - 7
100
75
18
50
B8 Class 1
All
75
30
30
50
B8M Class 1
All
75
30
30
50
B8 Class 2
Up to 3/4
125
100
12
35
7/8 - 1
115
80
15
35
1-1/8 - 1-1/4
105
65
20
35
1-3/8 - 1-1/2
100
50
28
45
B8M Class 2
Up to 3/4
110
95
15
45
7/8 - 1
100
80
20
45
1-1/8 - 1-1/4
95
65
25
45
1-3/8 - 1-1/2
90
50
30
45
Recommended Nuts and Washers
Bolt Grade
Nuts
Washers
B7
A194 Grade 2H
F436
B8 Class 1
A194 Grade 8
SS304
B8M Class 1
A194 Grade 8M
SS316
B8 Class 2
A194 Grade 8
SS304
B8M Class 2
A194 Grade 8M
SS316

Strain hardened nuts available as a supplementary requirement
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ASTM A193 B7/B7M
Stud bolts ASTM A193 B7—ASTM A194 2H
Date:2013-09-29  Model:

Standard: ASTM A193 B7—ASTM A194 2H
                   ASTM A193 B7M—ASTM A194 2HM
                   ASTM A320 L7—ASTM A194 GR.7
                   ASTM A320 L7M—ASTM A194 GR7M

MATERIAL: 1040,1045,4140,4142
Surface protection: Plain, Hot dip galvanized, Galvanization, Dacroment, Xylan .
Packing: Standard packing or According to customers' requirements
According to customers' Drawings and/or samples

 

Scope
Originally approved in 1936, this specification is heavily utilized in petroleum and chemical construction applications.  The ASTM standard covers alloy steel and stainless steel bolting materials for high temperature or high pressure service. This specification includes fasteners intended for use in pressure vessels, valves, flanges, and fittings. Although, this material is often available in national coarse (UNC) thread pitches, if being used in traditional applications, threads are specified 8 threads per inch (tpi) for diameters above one inch.
Below is a basic summary of a few of the common grades. ASTM A193 covers a number of other standard specifications not covered in this description including B5, B6, and B16.
Grades
B7
Alloy steel, AISI 4140/4142 quenched and tempered
B8
Class 1 Stainless steel, AISI 304, carbide solution treated.
B8M
Class 1 Stainless steel, AISI 316, carbide solution treated.
B8
Class 2 Stainless steel, AISI 304, carbide solution treated, strain hardened
B8M
Class 2 Stainless steel, AISI 316, carbide solution treated, strain hardened
Mechanical Properties
Grade
Size
Tensile ksi, min
Yield, ksi, min
Elong, %, min
RA % min
B7
Up to 2-1/2
125
105
16
50
2-5/8 - 4
115
95
16
50
4-1/8 - 7
100
75
18
50
B8 Class 1
All
75
30
30
50
B8M Class 1
All
75
30
30
50
B8 Class 2
Up to 3/4
125
100
12
35
7/8 - 1
115
80
15
35
1-1/8 - 1-1/4
105
65
20
35
1-3/8 - 1-1/2
100
50
28
45
B8M Class 2
Up to 3/4
110
95
15
45
7/8 - 1
100
80
20
45
1-1/8 - 1-1/4
95
65
25
45
1-3/8 - 1-1/2
90
50
30
45
Recommended Nuts and Washers
Bolt Grade
Washers
B7
F436
B8 Class 1
A194 Grade 8
SS304
B8M Class 1
A194 Grade 8M
SS316
B8 Class 2
A194 Grade 8
SS304
B8M Class 2
A194 Grade 8M
SS316

Strain hardened nuts available as a supplementary requirement


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