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Bolt Strength Requirements |
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SAE & ASTM Specifications
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Material and
Surface Treatment
|
Nominal Size (Inches) |
Mechanical Properties |
Hardness Rockwell |
Proof
Load
Min
(ksi) |
Yield
Strength
Min
(ksi) |
Tensile
Strength
Min
(ksi) |
Min |
Max |
SAE J429
Grade 1 |
Low or Medium Carbon Steel |
1/4" - 1½" |
33 |
36 |
60 |
B70 |
B100 |
A307
Grade A |
1/4" - 4" |
- |
- |
60 |
B69 |
B100 |
A307
Grade B |
- |
- |
60 min
100 max |
B69 |
B95 |
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A307
Grade C
Replaced by
ASTM F1554
Grade 36
|
- |
36 |
58 min
80 max |
- |
- |
F1554
Grade 36 |
- |
36 |
58 min
80 max |
- |
- |
F1554
Grade 55 |
- |
55 |
75 min
95 max |
- |
- |
SAE J429
Grade 2 |
1/4" - 3/4"
7/8" - 1½" |
55
33 |
57
36 |
74
60 |
B80
B70 |
B100
B100 |
A193/A320
Grade B8 |
AISI SS304 Stainless |
No Restrictions |
- |
30 |
75 |
- |
B96 |
A193/A320
Grade B8M |
AISI SS316 Stainless Steel |
A325
Type 1 |
Medium Carbon Steel, Quenched and Tempered |
1/2" - 1"
1 1/8" - 1 1/2" |
85
74 |
92
81 |
120
105 |
C24
C19 |
C35
C31 |
A325
Type 3 |
Atmospheric Corrosion Resistant Steel,
Quenched and Tempered |
SAE J429
Grade 5 |
Medium Carbon Steel, Quenched and Tempered |
1/4" - 1"
1 1/8" - 1 1/2" |
85
74 |
92
81 |
120
105 |
C25
C19 |
C34
C30 |
A449
Type 1 |
Medium Carbon Steel, Quenched and Tempered |
1/4" - 1"
1 1/8" - 1 1/2"
1 5/8" - 3" |
85
74
55 |
92
81
58 |
120
105
90 |
C25
C19
B91 |
C34
C30
B100 |
A449
Type 3 |
Weathering Steel, Quenched and Tempered |
1/4" - 1"
1 1/8" - 1 1/2"
1 3/8" - 3" |
85
74
55 |
92
81
58 |
120
105
90 |
C25
C19
B91 |
C34
C30
B100 |
A193
Grade B7 |
Medium Carbon Alloy Steel,
Quenched and Tempered |
1/4" - 2 1/2"
2 5/8" - 4"
4 1/8" - 7" |
- |
105
95
75 |
125
115
100 |
- |
C35
C35
C35 |
A354
Grade BC |
Medium Carbon Alloy Steel,
Quenched and Tempered |
1/4" - 2 1/2"
2 5/8" - 4" |
105
95 |
109
94 |
125
115 |
C26
C22 |
C36
C33 |
F1554
Grade 105 |
Medium Carbon Alloy Steel,
Quenched and Tempered |
1/4" - 3" |
- |
105 |
125 min
150 max |
- |
- |
A320
Grade L7 |
AISI 4140, 4142, or 4145 |
1/4" - 2 1/2" |
- |
105 |
125 |
- |
- |
A320
Grade L43 |
AISI 4340 |
1/4" - 4" |
- |
105 |
125 |
- |
- |
A490
Type 1 |
Medium Carbon Alloy Steel, Quenched and Tempered |
1/2" - 1 1/2" |
120 |
130 |
150 min
173 max |
C33 |
C38 |
A490
Type 3 |
Atmospheric Corrosion Resistant Steel,
Quenched and Tempered |
SAE J429
Grade 8 |
Medium Carbon Alloy Steel, Quenched and Tempered |
1/4" - 1 1/2" |
120 |
130 |
150 |
C33 |
C39 |
A354
Grade BD |
Medium Carbon Alloy Steel, Quenched and Tempered |
1/4" - 2 1/2"
2 5/8" - 4" |
120
105 |
130
115 |
150
140 |
C33
C31 |
C39
C39
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- All specifications are ASTM unless otherwise noted. All specifications shall be marked by the manufacturer with a unique identifier to identify the manufacturer or private label distributor, as appropriate.
- Although markings are shown on hex heads, stamping is a requirement on one end of rods and studs. The exception is F1554 and A307 grade C in which stamping is a supplemental requirement while color coding is required.
- Although markings are shown on hex heads, grade markings apply equally to products with other head configurations.
- All Grade BD products shall be marked "BD" or be marked with 6 radial lines 60° apart.
- ASTM A307 grade C has been replaced by ASTM F1554 Grade 36.
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