Machinery's Handbook, 31st Edition
1666 BOLTS AND NUTS Grade Marks and Material Properties for Bolts and Screws.— Bolts, screws, and other fasteners are marked on the head with a symbol that identifies the grade of the fastener. The grade specification establishes the minimum mechanical properties that the fastener must meet. Additionally, industrial fasteners must be stamped with a registered head mark that identifies the manufacturer. The grade identification table identifies the grade markings and gives mechanical properties for some commonly used ASTM and SAE steel fasteners. Metric fasteners are identified by property grade marks, which are speci - fied in ISO and SAE standards. These marks are discussed with metric fasteners. Grade Identification Marks and Mechanical Properties of Bolts and Screws
A 325
A 325
A 325
F
B
E
D
C
NO MARK A
A 490
BC
A 490
I
J
H
K
G
L
Min. Strength (10 3 psi)
Material & Treatment
Size (in.)
Proof
Tensile Yield
Identifier
Grade
SAE Grade 1 ASTM A307
33 33 55 33 65 85 74 55 85 85 74 85 74 85 74
60 60 74 60
36 36 57 36
1 3
1 ∕ 4 to 1 1 ∕ 2 1 ∕ 4 to 1 1 ∕ 2 1 ∕ 4 to 3 ∕ 4 7 ∕ 8 to 1 1 ∕ 2 1 ∕ 4 to 1 1 ∕ 2
A
SAE Grade 2
1
SAE Grade 4
115 120 105
100
2, a
92 81 58 92 92 81 92 81 92 81
SAE Grade 5, ASTM A449
1 ∕ 4 to 1
ASTM A449 ASTM A449 SAE Grade 5.2
2,b
B
1 1 ∕ 8 to 1 1 ∕ 2
90
1 3 ∕ 4 to 3
C
120 120 105 120 105 120 105 125 115 133 150 150 140 150 150
4, b
1 ∕ 4 to 1 1 ∕ 2 to 1
D
ASTM A325, Type 1
2,b
1 1 ∕ 8 to 1 1 ∕ 2
1 ∕ 2 to 1
E
ASTM A325, Type 2
4, b
1 1 ∕ 8 to 1 1 ∕ 2
1 ∕ 2 to 1
F
ASTM A325, Type 3
5, b
1 1 ∕ 8 to 1 1 ∕ 2 1 ∕ 4 to 2 1 ∕ 2
105
109
G
ASTM A354, Grade BC
5, b
95
99
2 5 ∕ 8 to 4
H
SAE Grade 7 SAE Grade 8
105 120 120 105 120 120
115 130 130 115 130 130
7, b 7, b
1 ∕ 4 to 1 1 ∕ 2 1 ∕ 4 to 1 1 ∕ 2 1 ∕ 4 to 2 1 ∕ 2 2 5 ∕ 8 to 4
I
ASTM A354, Grade BD
6, b
J
SAE Grade 8.2
4, b 6, b
1 ∕ 4 to 1
K L
ASTM A490, Type 1 ASTM A490, Type 3
∕ 2 to 1 1 ∕ 2
1
5, b Material Steel: 1—low or medium carbon; 2—medium carbon; 3—low carbon; 4—low-carbon martensite; 5—weathering steel; 6—alloy steel; 7—medium-carbon alloy. Treatment: a—cold drawn; b—quench and temper.
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