A563 Mechanical Properties
| Grade | Style | Size, in. | Proof Load, ksi | Hardness, HBN | |
|---|---|---|---|---|---|
| Plain | Galvanized | ||||
| A | Hex | 1/4 - 1-1/2 | 90 | 68 | 116 - 302 |
| Heavy Hex | 1/4 - 4 | 100 | 75 | 116 - 302 | |
| B | Heavy Hex | 1/4 - 1 | 133 | 100 | 121 - 302 |
| Heavy Hex | 1-1/8 - 1-1/2 | 116 | 87 | 121 - 302 | |
| C / C3 | Heavy Hex | 1/4 - 4 | 144 | 144 | 143 - 352 |
| D | Heavy Hex | 1/4 - 4 | 150 | 150 | 248 - 352 |
| DH / DH3 | Heavy Hex | 1/4 - 4 | 175 | 150 | 248 - 352 |
| For UNC, 8UN, 6UN, and Coarse Pitch Threads | |||||