Fastener
Markings - Bolts
| Grade Identification Marking |
Specification |
Material |
Nominal Size In. |
Proof Load Stress ksi |
Tensile Strength Min ksi |
Hardness Rockwell |
| Min |
Max |
 |
SAE J429 - Grade 1 |
Low or Medium Carbon Steel |
1/4
thru
1 1/2 |
33 |
60 |
B70 |
B100 |
| SAE J429 - Grade 2 |
1/4
thru 3/4
over 3/4
thru 1 1/2 |
55
33 |
74
60 |
B80
B70 |
B100
B100 |
| ASTM A307 - Grade A |
1/4 thru 4 |
|
60 |
B69 |
B100 |
| ASTM A307 - Grade B |
1/4 thru 4 |
|
60 min
100 max |
B69 |
B95 |
 |
SAE J429 - Grade 5
ASTM A449 - Type 1 |
Medium Carbon Steel, Quenched and Tempered |
1/4
thru 1
over 1
thru 1 1/2 |
85
74 |
120
105 |
C25
C19 |
C34
C30 |
| ASTM A449 - Type 1 |
over
1/2
thru 3 |
55 |
90 |
183 |
235 |
 |
SAE J429 - Grade 5.1 |
Low or Medium Carbon Steel, Quenched and Tempered |
No. 6 thru 1/2 |
85 |
120 |
C25 |
C40 |
 |
SAE J429 - Grade 5.1 |
Low Carbon Martensite Steel, Quenched and Tempered |
1/4 thru 1 |
85 |
120 |
C26 |
C36 |
| ASTM A449 - Type 2 |
C25 |
C34 |
 |
ASTM A325 - Type 1 |
Medium Carbon Steel, Quenched and Tempered |
1/2
thru 1
over 1 to
1 1/2 |
85
74 |
120
105 |
C24
C19 |
C35
C31 |
 |
ASTM A325 - Type 2 |
Low Carbon Steel, Quenched and Tempered |
 |
ASTM A325 - Type 3 |
Atmospheric Corrosion Resistant Steel, Quenched and Tempered |
|
ASTM A354 Grade BC |
Medium Carbon Alloy Steel. Quenched and Tempered
|
1/4
thru 2 1/2
over 2 1/2
thru 4 |
105
95 |
125
115 |
C26
C22 |
C36
C33 |
|
SAE J429 Grade 8 |
Medium Carbon Alloy Steel, Quenched and Tempered |
1/4 thru 1 1/2 |
120 |
150 |
C33 |
C39 |
| ASTM A354 Grade BD |
1/4
thru 2 1/2
over 2 1/2
thru 4 |
120
105 |
150
140 |
C33
C31 |
C39
C39 |
|
SAE J429 Grade 8.2 |
Low Carbon Martensite Steel, Quenched and Tempered |
1/4 thru 1 |
120 |
150 |
C33 |
C39 |
|
ASTM A490 Type 1 |
Medium Carbon Alloy Steel, Quenched and Tempered |
1/2 thru 1 1/2 |
120 |
150 min
170 max |
C33 |
C38 |
 |
ASTM A490 Type 2 |
Low Carbon Martensite Steel, Quenched and Tempered |
1/2 thru 1 |
120 |
150 min
170 max |
C33 |
C38 |
 |
ASTM A490 Type 3 |
Atmospheric Corrosion Resistant Steel, Quenched and Tempered |
1/2 thru 1 1/2 |
120 |
150 min
170 max |
C33 |
C38 |
|
