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| Bolt Grade Identification Marking |
Specification |
Nominal Size
(inch) |
Proof Load Stress
(ksi) |
Tensile Strength
(min ksi) |
Material
Notes |
 |
SAE Grade 1 |
1/4 to 1 1/2 |
33 |
60 |
1 |
| SAE Grade 2 |
1/4 thru 3/4 |
55 |
74 |
| over 3/4 thru 1-1/2 |
33 |
60 |
| ASTM A307 |
1/4 to 1 1/2 |
33 |
60 |
3 |
| SAE Grade 4 |
1/4 to 1 1/2 |
65 |
115 |
2,a |
 |
SAE - Grade 5 |
1/4 thru 1 |
85 |
120 |
2, b |
| ASTM A449 - Type 1 |
1 1/8 thru 1-1/2 |
74 |
105 |
| 1 3/4 thru 3 |
55 |
90 |
 |
SAE - Grade 5.2 |
1/4 thru 1 |
85 |
120 |
4, b |
 |
ASTM A325 - Type 1 |
1/2 thru 1 |
85 |
120 |
2, b |
| 1 1/8 to 1-1/2 |
74 |
105 |
 |
ASTM A325 - Type 2 |
1/2 thru 1 |
85 |
120 |
4,b |
| 1 1/8 to 1-1/2 |
74 |
105 |
 |
ASTM A325 - Type 3 |
1/2 thru 1 |
85 |
120 |
5,b |
| 1 1/8 to 1-1/2 |
74 |
105 |
 |
ASTM A354 - Grade BC |
1/4 thru 2-1/2 |
105 |
125 |
5,b |
| 2-3/4 thru 4 |
95 |
115 |
 |
SAE Grade 7 |
1/4 to 1 1/2 |
105 |
133 |
7,b |
 |
SAE - Grade 8 |
1/4 thru 1-1/2 |
120 |
150 |
7,b |
| ASTM A354 - Grade BD |
1/4 thru 1-1/2 |
120 |
150 |
6,b |
 |
SAE - Grade 8.2 |
1/4 thru 1 |
120 |
150 |
4,b |
 |
ASTM A490 - Type 1 |
1/2 thru 1-1/2 |
120 |
150 |
6,b |
 |
ASTM A490 - Type 3 |
1/2 thru 1-1/2 |
120 |
150 |
5,b |
Material Notes
- Low or Medium Carbon Steel
- Medium Carbon Steel
- Low Carbon
- Low Carbon Martensite
- Weathering Steel
- Alloy Steel
- Medium Carbon Alloy
Treatment
a - cold drawn
b - quenched and tempered
Releated References:
Screw Thread Limits Table
UNC UNF Threads Per Inch TPI Threads Per Inch
Wood Screw Pilot Hole Sizes Table
Standard NPT National Pipe Thread Tap Drill Sizes Table
ASTM ISO Metric Thread Sizes and Tap Drill Table
Metric Thread Size Tap Drill Table
Standard Tap Drills Clearance Holes Table
Standard Drill Sizes Decimal Equivalents Table
Socket Head Cap Screw Sizes Dimension Table
SAE Grade ASTM Bolt Identify Marks Mechanical Properties
Steel Bolt Torque Specifications Table
Finished Hex Nut Dimensions
Heavy Hex Nut Dimensions Table
Standard ANSI Type B Flat Washer Sizes
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