| Grade/Class | Strength |
|---|
| Grade A Nuts | Strength exceeds Grade 2. |
| ASTM A325 | Bolts meet ASTM A325 Type 1 standards for structural steel joints. |
| Grade B Nuts | Strength is similar to Grade 5. |
Grade B7 Threaded
Stud & Rod | Same as Grade 5. Use with Grade 2H and Grade C nuts. |
| Grade C Nuts | Strength exceeds Grade 5. Use with heat-treated medium-strength steel fasteners like ASTM A325 structural bolts. |
| Grade G Nuts | Strength is similar to Grade 8. Use with ASTM A325 structural bolts. |
| Grade 2 | Low strength. |
| Grade 2H Nuts | Strength is similar to Grade 5. Use with ASTM A325 structural bolts. |
| Grade 5 | Medium strength. |
| Grade 8 | High strength. |
| Metric Class 4 | Similar to Grade 2. |
| Metric Class 8.8 | Similar to Grade 5. |
| Metric Class 10.9 | Similar to Grade 8. |
| Metric Class 12.9 | The highest metric class for strength, it exceeds Grade 8. |
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