Q & T
Q & T means quenched and tempered.
Strength Requirements by Grade
A practical reference for common fastener grades, material treatments, nominal size ranges, proof load, yield strength, tensile strength, elongation, reduction of area, and Rockwell hardness.
Strength Table
Showing 28 of 28 strength records.
| Marking | Specification | Material / Treatment | Nominal Size | Proof Load Min | Yield Min | Tensile Min | Elong % Min | RA % Min | Rockwell Min | Rockwell Max |
|---|---|---|---|---|---|---|---|---|---|---|
SAE J429 Grade 1
|
SAE J429 Grade 1 | Low or medium carbon steel | 1/4" - 1-1/2" | 33 | 36 | 60 | 18 | 35 | B70 | B100 |
ASTM A307 Grade A
|
ASTM A307 Grade A | Low or medium carbon steel | 1/4" - 4" | - | - | 60 | 18 | - | B69 | B100 |
ASTM A307 Grade B
|
ASTM A307 Grade B | Low or medium carbon steel | 1/4" - 4" | - | - | 60 min / 100 max | 18 | - | B69 | B95 |
ASTM A307 Grade C
|
ASTM A307 Grade C | Low or medium carbon steel | 1/4" - 4" | - | 36 | 58 min / 80 max | 23 | - | - | - |
ASTM F1554 Grade 36
|
ASTM F1554 Grade 36 | Low or medium carbon steel | 1/2" - 4" | - | 36 | 58 min / 80 max | 23 | 40 | - | - |
ASTM F1554 Grade 55
|
ASTM F1554 Grade 55 | Low or medium carbon steel | 1/2" - 4" | - | 55 | 75 min / 95 max | 21 | 30 | - | - |
ASTM F1554 Grade 105
|
ASTM F1554 Grade 105 | Medium carbon alloy steel, Q & T | 1/2" - 3" | - | 105 | 125 min / 150 max | 15 | 45 | - | - |
SAE J429 Grade 5
|
SAE J429 Grade 5 | Medium carbon steel, Q & T | 1/4" - 1" | 85 | 92 | 120 | 14 | 35 | C25 | C34 |
|
SAE J429 Grade 5
|
SAE J429 Grade 5 | Medium carbon steel, Q & T | 1-1/8" - 1-1/2" | 74 | 81 | 105 | 14 | 35 | C19 | C30 |
SAE J429 Grade 8
|
SAE J429 Grade 8 | Medium carbon alloy steel, Q & T | 1/4" - 1-1/2" | 120 | 130 | 150 | 12 | 35 | C33 | C39 |
ASTM A193 Grade B7
|
ASTM A193 Grade B7 | Medium carbon alloy steel, Q & T | 1/4" - 2-1/2" | - | 105 | 125 | 16 | 50 | - | C35 |
|
ASTM A193 Grade B7
|
ASTM A193 Grade B7 | Medium carbon alloy steel, Q & T | 2-5/8" - 4" | - | 95 | 115 | 16 | 50 | - | C35 |
|
ASTM A193 Grade B7
|
ASTM A193 Grade B7 | Medium carbon alloy steel, Q & T | 4-1/8" - 7" | - | 75 | 100 | 18 | 50 | - | C35 |
ASTM A193/A320 B8 Class 1
|
ASTM A193/A320 B8 Class 1 | AISI 304 stainless steel | No restriction | - | 30 | 75 | 30 | 50 | - | B96 |
ASTM A193/A320 B8 Class 2
|
ASTM A193/A320 B8 Class 2 | AISI 304 stainless steel | Up to 3/4" | - | 100 | 125 | 12 | 35 | - | C35 |
ASTM A193/A320 B8M Class 1
|
ASTM A193/A320 B8M Class 1 | AISI 316 stainless steel | No restriction | - | 30 | 75 | 30 | 50 | - | B96 |
ASTM A193/A320 B8M Class 2
|
ASTM A193/A320 B8M Class 2 | AISI 316 stainless steel | Up to 3/4" | - | 95 | 110 | 15 | 45 | - | C35 |
ASTM F3125 Grade A325 Type 1
|
ASTM F3125 Grade A325 Type 1 | Medium carbon steel, Q & T | 1/2" - 1-1/2" | 85 | 92 | 120 | 14 | 35 | C24 | C35 |
ASTM F3125 Grade A325 Type 3
|
ASTM F3125 Grade A325 Type 3 | Weathering steel, Q & T | 1/2" - 1-1/2" | 85 | 92 | 120 | 14 | 35 | C24 | C35 |
ASTM F3125 Grade A490 Type 1
|
ASTM F3125 Grade A490 Type 1 | Medium carbon alloy steel, Q & T | 1/2" - 1-1/2" | 120 | 130 | 150 min / 173 max | 14 | 40 | C33 | C38 |
ASTM F3125 Grade A490 Type 3
|
ASTM F3125 Grade A490 Type 3 | Weathering steel, Q & T | 1/2" - 1-1/2" | 120 | 130 | 150 min / 173 max | 14 | 40 | C33 | C38 |
ASTM A449 Type 1
|
ASTM A449 Type 1 | Medium carbon steel, Q & T | 1/4" - 1" | 85 | 92 | 120 | 14 | 35 | C25 | C34 |
|
ASTM A449 Type 1
|
ASTM A449 Type 1 | Medium carbon steel, Q & T | 1-1/8" - 1-1/2" | 74 | 81 | 105 | 14 | 35 | C19 | C30 |
|
ASTM A449 Type 1
|
ASTM A449 Type 1 | Medium carbon steel, Q & T | 1-5/8" - 3" | 55 | 58 | 90 | 14 | 35 | B91 | B100 |
ASTM A354 Grade BC
|
ASTM A354 Grade BC | Medium carbon alloy steel, Q & T | 1/4" - 2-1/2" | 105 | 109 | 125 | 16 | 50 | C26 | C36 |
ASTM A354 Grade BD
|
ASTM A354 Grade BD | Medium carbon alloy steel, Q & T | 1/4" - 4" | - | 130 | 150 min / 173 max | 14 | 40 | C33 | C38 |
ASTM A320 Grade L7
|
ASTM A320 Grade L7 | AISI 4140, 4142, or 4145 | 1/4" - 2-1/2" | - | 105 | 125 | 16 | 50 | - | - |
ASTM A320 Grade L43
|
ASTM A320 Grade L43 | AISI 4340 | 1/4" - 4" | - | 105 | 125 | 16 | 50 | - | - |
Notes
Strength Units
Proof, yield, and tensile values are listed in ksi, or thousands of pounds per square inch.
A325 / A490
A325 and A490 are commonly seen on drawings, but structural bolt assemblies are now covered under ASTM F3125.
Actual Load
To estimate actual force capacity, multiply the ksi value by the fastener stress area.
Need Help Comparing Grades?
Send the grade, diameter, finish, and project specification to Lord & Sons and we can help identify the correct fastener requirement.