Hex Bolt Identification, Markings and Strength Chart Table Guide
Hex Bolt Identification, Markings and Strength Chart Table Guide
Hex Bolt Identification, Markings and Strength Chart. Additonal information on bolts is located at the bottom of the webpage.
Note: Some bolts share identical head identification and have significantly different strengths.
| Identification Grade Mark |
Specification | Description | Material | Proof Load | Yield Strength Min (psi) |
Tensile Strength Min (psi) |
 |
SAE J429 Grade 5 ASTM A449 |
Bolts, Screws, Studs |
Medium Carbon Steel | 85,000 74,000 |
92,000 thru 81,000 |
120,000 thru 105,000 |
 |
SAE J429 Grade 5.1 |
Sems | Low or Medium Carbon Steel | 85,000 | - | 120,000 |
 |
SAE J429 Grade 5.2 |
Bolts, Screws, Studs |
Low Carbon | 85,000 | 92,000 | 120,000 |
 |
ASTM A325 Type 1 |
High Strength Structural Bolts |
Medium Carbon | 85,000 74,000 |
92,000 thru 81,000 |
120,000 thru 105,000 |
 |
ASTM A325 Type 2 |
High Strength Structural Bolts |
Low Carbon | 85,000 | 92,000 | 120,000 |
 |
ASTM A325 Type 3 |
High Strength Structural Bolts |
Corrion Resistant Steel |
85,000 74,000 |
92,000 81,000 |
120,000 105,000 |
 |
ASTM A354 Grade BB |
Bolts, Studs | Alloy Steel | 80,000 75,000 |
83,000 78,000 |
105,000 100,000 |
 |
ASTM A354 Grade BC |
Bolts, Studs | Alloy Steel | 105,000 95,000 |
109,000 99,000 |
125,000 115,000 |
 |
SAE J429 Grade 7 |
Bolts, Screws | Medium Carbon Alloy Steel | 105,000 | 115,000 | 133,000 |
 |
SAE J429 Grade 8 |
Bolts, Screws, Studs |
Medium Carbon Alloy Steel | 120,000 | 130,000 | 150,000 |
| |
ASTM A354 Grade BD |
Bolts, Screws, Studs |
Alloy Steel | 120,000 | 130,000 | 150,000 |
 |
SAE J429 Grade 8.1 |
Studs | Medium Carbon Steel | 120,000 | 130,000 | 150,000 |
 |
ASTM A490 | Structural Bolts | Alloy Steel | 120,000 | 130,000 | 150,000 thru 170,000 |
| |
ISO R898 Class 4.6 |
Bolts, Screws, Studs | Low or Median Steel | 33,000 | 36,000 | 60,000 |
| |
ISO R898 Class 5.8 |
Bolts, Screws, Studs | Low or Median Steel | 55,000 | 57,000 | 74,000 |
 |
ISO R898 Class 8.8 |
Bolts, Screws, Studs | Median Steel | 85,000 | 92,000 | 120,000 |
 |
ISO R898 Class 8.8 |
Bolts, Screws, Studs | Median Steel | 85,000 | 92,000 | 120,000 |
 |
ISO R898 Class 10.9 |
Bolts, Screws, Studs | Alloy Steel | 120,000 | 130,000 | 150,000 |
 |
ISO R898 Class 10.9 |
Bolts, Screws, Studs | Alloy Steel | 120,000 | 130,000 | 150,000 |
 |
ASTM A320 Grade B8 |
Bolts, Screws, Studs | AISI 304 | - | 30,000 | 75,000 |
 |
ASTM A320 Grade B8C |
Bolts, Screws, Studs | AISI 347 | - | 30,000 | 75,000 |
 |
ASTM A320 Grade B8T |
Bolts, Screws, Studs | AISI 321 | - | 30,000 | 75,000 |
 |
ASTM A320 Grade B8F |
Bolts, Screws, Studs | AISI 303 or 303Se |
- | 30,000 | 75,000 |
 |
ASTM A320 Grade B8F |
Bolts, Screws, Studs | AISI 316 | - | 30,000 | 75,000 |
 |
ASTM A320 Grade B8 |
Bolts, Screws, Studs | AISI 304 | - | 50,000 Thru 100,000 |
105,000 Thru 125,000 |
 |
ASTM A320 Grade B8C |
Bolts, Screws, Studs | AISI 347 | - | 50,000 Thru 100,000 |
105,000 Thru 125,000 |
 |
ASTM A320 Grade B8F |
Bolts, Screws, Studs | AISI 303 or 303Se |
- | 50,000 Thru 100,000 |
105,000 Thru 125,000 |
 |
ASTM A320 Grade B8M |
Bolts, Screws, Studs | AISI 316 | - | 50,000 Thru 100,000 |
105,000 Thru 125,000 |
 |
ASTM A320 Grade B8T |
Bolts, Screws, Studs | AISI 321 | - | 50,000 Thru 100,000 |
105,000 Thru 125,000 |
| |
ASTM A193 Grade B8T |
Bolts, Screws, Studs | AISI 321 | 30,000 | 75,000 | |
| |
ASTM A193 Grade B8 |
Bolts, Screws, Studs | AISI 304 | - | 50,000 thru 100,000 |
100,000 thru 125,000 |
| |
ASTM A193 Grade B8C |
Bolts, Screws, Studs | AISI 347 | - | 50,000 thru 100,000 |
100,000 thru 125,000 |
| |
ASTM A193 Grade B8M |
Bolts, Screws, Studs | AISI 316 | - | 50,000 thru 95,000 |
90,000 thru 125,000 |
| |
ASTM A193 Grade B8T |
Bolts, Screws, Studs | AISI | - | 50,000 thru 95,000 |
100,000 thru 120,000 |
| |
SAE J429 Grade 1 |
Bolts, Screws, Studs | Low or Median Carbon Steel | 33,000 | 36,000 | 60,000 |
 |
ASTM A320 Grade L7B |
Bolts, Screws, Studs, Low temp Appl. |
AISI 4137 | - | 105,000 | 125,000 |
 |
ASTM A320 Grade L7C |
Bolts, Screws, Studs, Low temp Appl. |
AISI 8740 | - | 105,000 | 125,000 |
-
Tensile Strength: The maximum load in tension (pulling apart) which a material can withstand before breaking or fracturing.
-
Yield Strength: The maximum load at which a material exhibits a specific permanent deformation
-
Proof Load: An axial tensile load which the product must withstand without evidence of any permanent set.
-
1MPa = 1N/mm2 = 145 pounds/inch2
Link to this Webpage:
© Copyright 2000 -
2024, by Engineers Edge, LLC
www.engineersedge.com
All rights reserved
Disclaimer |
Feedback
Advertising
| Contact
