A307 Grade A fasteners
| Grade Marking | Specification | Material and Treatment | Nominal Size (in.) | Mechanical Properties | Hardness Rockwell |
|---|
| Proof Load Min (ksi) | Yield Strength Min (ksi) | Tensile Strength Min (ksi) | Elong % Min | RA % Min | Min | Max |
|---|
| PB | SAE J429 Grade 1 | Low or Medium Carbon Steel | 1/4" – 1 1/2" | 33 | 36 | 60 | 18 | 35 | B70 | B100 |
| PB 307A | A307 Grade A | Low or Medium Carbon Steel | 1/4" – 4" | – | – | 60 | 18 | – | B69 | B100 |
| PB | SAE J429 Grade 2 | Low or Medium Carbon Steel | 1/4" – 3/4" | 55 | 57 | 74 | 18 | 35 | B80 | B100 |
| PB | SAE J429 Grade 2 | Low or Medium Carbon Steel | 7/8" – 1 1/2" | 33 | 36 | 60 | 18 | 35 | B70 | B100 |
