| Grade
Marking |
Spec. | Material | Bolt
&
Screw Size |
Proof
Load PSI |
Tensile
Strength Min PSI |
 |
SAE-Grade 1 | Low Carbon Steel | 1/4" - 1-1/2" | 33,000 | 60,000 |
|
ASTM-A307 | Low Carbon Steel | 1/4"
- 1/2"
1-1/2" - 4" |
33,000 | 60,000
55,000 |
|
SAE-Grade 2 | Low Carbon Steel | 1/4"
- 3/4"
3/4" - 1-1/2" |
55,000
33,000 |
74,000
60,000 |
 |
SAE-Grade 3 | Medium
Carbon Steel,
Cold Worked |
1/4"
- 1-1/2"
1/2" - 5/8" |
85,000
80,000 |
110,000
100,000 |
 |
SAE-Grade
5
ASTM-A 449 |
Medium
Carbon Steel,
Quenched & Tempered |
1/4"
- 1"
Over 1" - 1-1/2" Over 1-1/2" - 3" |
85,000
74,000 55,000 |
120,000
105,000 090,000 |
 |
ASTM-A 325 | Medium
Carbon Steel,
Quenched & Tempered |
1/2",
5/8", 3/4"
7/8", 1" 1-1/8" - 1-1/2" |
85,000
78,000 74,000 |
120,000
115,000 105,000 |
 |
ASTM-A
354
Grade BB |
Low
Alloy Steel,
Quenched & Tempered |
1/4"
- 2-1/2"
Over 2-1/2" - 4" |
80,000
75,000 |
105,000
100,000 |
 |
ASTM-A
354
Grade BC |
Low
Alloy Steel,
Quenched & Tempered |
1/4"
- 2-1/2"
Over 2-1/2" -4" |
105,000
095,000 |
125,000
115,000 |
 |
SAE-Grade 5.1 | Low
or Medium Carbon
Steel, Quenched & Tempered, with Assembled Lock Washer |
Up to 3/8" incl. | 85,000 | 120,000 |
 |
SAE-Grade 7 |
Quenched & Tempered, Roll Threaded after Heat Treatment |
1/4" - 1-1/2" | 105,000 | 133,000 |
 |
SAE-Grade 8 | Medium
Carbon Alloy
Steel, Quenched & Tempered |
1/4" - 1-1/2" | 120,000 | 150,000 |
|
ASTM-A
354
Grade BD |
Alloy
Steel,
Quenched & Tempered |
1/4" - 1-1/2" | 120,000 | 150,000 |
 |
ASTM-A 490 | Alloy
Steel,
Quenched & Tempered |
1/2"
- 2-1/2"
Over 2-1/2" - 4" |
120,000
105,000 |
150,000
140,000 |