Material number T11302: 1.3343
T11302 is the Unified Numbering System designation for 1.3343, high-speed steel, tungsten-molybdenum specified in EN ISO 4957.
Reading T11302 digit by digit
A UNS designation (ASTM E527 / SAE J1086) is a letter followed by five digits. The letter T marks the alloy family — here tool steels — and the five digits 11302 place the composition inside it, usually by carrying an older AISI or SAE number forward.
What a UNS number does not carry is the product form or the property level. T11302 therefore appears in several ASTM specifications — plate, bar, pipe, forging — each with its own mechanical requirements, and the number alone is not a complete purchase specification.
T11302 identity card
| Item | Value |
|---|---|
| UNS number (ASTM E527) | T11302 |
| Symbolic grade name | 1.3343 |
| Steel group | T — tool steels |
| Sequential number in group | 11302 |
| Specified in | EN ISO 4957 |
| Steel family | Tool steel |
| Also carries Werkstoff No. | 1.3343 |
| Tensile, same condition | ≈ 800–900 (typ.) MPa |
| Cross-references held | 8 grades in 5 systems |
1.3343 (HS6-5-2C) is AISI M2, the general-purpose high-speed steel: 64–66 HRC and red hardness to 600 °C. Composition, the 1190–1230 °C hardening window, triple tempering and M2/SKH51 equivalents.
Full data sheet for 1.3343 → · Equivalent grades → · EN ISO 4957 →
UNS T — the neighbouring numbers
Same UNS letter, so the same alloy family. The digits generally carry an older AISI or SAE number.