| Grade Marking |
Specification |
Material |
Bolt and Screw
Size (Inches) |
Proof Load
psi |
Tensile Strength
min. psi |
 |
SAE Grade 1 |
|
|
|
|
| ASTM A307 |
Low Carbon Steel |
1/4 thru 1-1/2
1/4 thru 1-1/2
Over 1-1/2 thru 4 |
33000
33000 |
60000
60000
55000 |
| SAE Grade 2 |
Low Carbon Steel |
1/4 thru 3/4
Over 3/4 thru 1-1/2 |
55000
33000 |
74000
60000 |
 |
SAE Grade 3 |
Med. Carbon Steel Cold Worked |
1/4 thru 1/2
Over 1/2 thru 5/8 |
85000
80000 |
110000
100000 |
 |
SAE Grade 5 |
Med. Carbon Steel Quenched and
Tempered |
1/4 thru 1
Over 1 thru 1-1/2 |
85000
74000 |
120000
105000 |
| ASTM A449 |
|
1/4 thru 1
Over 1 thru 1-1/2
Over 1-1/2 thru 3 |
85000
74000
55000 |
120000
105000
90000 |
 |
ASTM A325 |
Med. Carbon Steel Quenched and
Tempered |
1/2, 5/8, 3/4
7/8, 1
1-1/8 thru 1-1/2 |
85000
78000
74000 |
120000
115000
105000 |
 |
ASTM A354
Grade BB |
Low Alloy Steel Quenched and
Tempered |
1/4 thru 2-1/2
Over 2-1/2 thru 4 |
80000
75000 |
105000
100000 |
 |
ASTM A354
Grade BC |
Low Alloy Steel Quenched and
Tempered |
1/4 thru 2-1/2
Over 2-1/2 thru 4 |
105000
75000 |
125000
100000 |
 |
SAE Grade 5.1 |
Low or Med Carbon
Steel Quenched and Tempered with
Assembled Lock Washer |
Up to 3/8 incl. |
85000 |
120000 |
 |
SAE Grade 7 |
Med. Carbon Alloy
Steel Quenched and Tempered. Roll
Threaded after Heat Treated |
1/4 thru 1-1/2 |
105000 |
133000 |
 |
SAE Grade 8 |
Med. Carbon Alloy
Steel, Quenched and
Tempered |
|
|
|
ASTM A354
Grade BD |
Alloy Steel Quenched
and Tempered |
1/4 thru 1-1/2 |
120000 |
150000 |
 |
ASTM A490 |
Alloy Steel, Quenched and
Tempered |
1/2 thru 2-1/2
Over 2-1/2 thru 4 |
120000
105000 |
150000
140000 |
