SAE
Society of Automotive Engineers.
These are some of the most common grades of bolts and nuts. The SAE standard is often omitted in the descriptions of these fasteners, but is implied. Example: Grade 2, Grade 5, and Grade 8.
SAE J429 - Bolts
| Grade | Material | Yield Strength (ksi) | Tensile Strength (ksi) | Marking |
|---|---|---|---|---|
| Grade 2 | Low Carbon Steel | 36 - 57 | 60 - 74 | No Marking |
| Grade 5 | Medium Carbon Steel | 81 - 92 | 105 - 120 | 3 lines |
| Grade 8 | Alloy Steel | 130 | 150 | 6 Lines |
SAE J995 - Nuts
| Grade | Material | Proof Load (ksi) | Marking |
|---|---|---|---|
| Grade 2 | Low Carbon Steel | 90 | No Marking |
| Grade 5 | Medium Carbon Steel | 105 - 120 | Dashes Separated |
| Grade 8 | Alloy Steel | 150 | Dashes Close |