M3 / DIN 1.3344 / AISI M3 is a highly alloyed high-speed steel manufactured for high hardness and wear resistance. Toolman describes M3 Type II as a tungsten-molybdenum high speed tool steel with increased carbon and vanadium content, developed to provide strong wear resistance in severe cutting operations.

We supply M3 for tap drills, reamers, heavy-duty milling cutters, dies, broach needles, hexagon socket punches and piercing dies for nut production. M3 Type II is highly associated with high-performance mills, reamers and broaches used for processing hard materials.

Toolman specifies a maximum annealed hardness of 280 HBW and a minimum quenching-and-tempering hardness of 64 HRC. Its published heat-treatment information indicates approximately 64–66 HRC after tempering, depending on the selected tempering temperature and treatment cycle.

Our product page specifies soft annealing at 820–860°C. Its hardening sequence includes preheating stages before hardening at 1190–1300°C, followed by oil or air quenching or a warm bath at 550°C. Tempering is specified at 540–570°C at least three times, resulting in approximately 64–66 HRC.

Toolman states that M3 has the basic chemical composition of M2 but with higher vanadium and carbon content. Its M3 page associates this composition with very high resistance to wear and softening, high blade resistance, good toughness and a deep-hardening response.

We supply M3 rounds from 6–405 mm, depending on condition. Listed square sizes extend from 7.2 mm up to 305 mm, while flats are available from 5–105 mm thickness and 21–205 mm width, depending on the specified manufacturing condition.

Yes. Our M3 / 1.3344 high speed steel is subjected to testing and quality control and certificates and test reports can be supplied on request. This allows manufacturers to request supporting documentation when sourcing material for tooling production.