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Tensile strength for the various specifications of hardened and tempered material in BS 970 are designated with the reference symbols P to Z.
| Reference Symbol | Tensile Strength N/mm²* | Tensile Strength tons/sq. in. |
|---|---|---|
| P | 550-700 | 35-45 |
| Q | 625-775 | 45-50 |
| R | 700-850 | 45-55 |
| S | 775-925 | 50-60 |
| T | 850-1000 | 55-65 |
| U | 925-1075 | 60-70 |
| V | 1000-1150 | 65-75 |
| W | 1075-1225 | 70-80 |
| X | 1150-1300 | 75-85 |
| Y | 1225-1375 | 80-90 |
| Z | 1550min | 100min |
| *1 N/mm2 = 1MPa | ||
