Din 1.3343 is a standard high-speed steel grade. Having balanced alloy composition forms the basis of its high toughness and good cutting edge retention, rendering it suitable for a large variety of applications.This grade is mainly used for all metal-cutting tools for roughing or finishing such as twist drills, diverse milling cutters, thread dies, broaches, reamers, countersinks, thread chasers, circular saw segments, shaping tools and woodworking tools. Also highly suitable for cold-forming tools such as cold extrusion rams and dies, as well as cutting and precision cutting tools, plastic moulds with elevated wear resistance and screws.

Equivalent Grades

American German Japanese China Poland
  (W.Nr) (DIN)      
AISI M-2 1.3343HS6-5-2SKH51W6Mo5Cr4V2SW7M

Chemical Composition (AISI M-2)

  C Si Mn P S Cr Mo V W Co Ni

Physical Properties

Thermal Conductivity at °C20350700
W/(m • K)32.823.525.5


For tools with high shock and impact resistance as well as high torsion stress:

1.Tooling Industry: End Mill, Drill, Punch, Tap, Reamer

2.Forging Industry: Forging Mould, Press Mould

3.Moulding Industry: Mould, Screw Mould

Heat Treatment

Soft annealing°C                 Cooling                                  Hardness HB

770 – 860                                                      Furnace                                                          max. 269

Stress-relief annealing °C                  Cooling

630 – 650                                                       Furnace

1st                         2nd and 3rd        Hardening1 °C Quenching Tempering °C Hardness after pre-heating °C        pre-heating °C                                    tempering HRC

up to approx. 400 in an air-circulating

furnace                  a) 850                  1190 – 1230       a) Saltbath,    at least                64 – 66

550 °C        twice

b) 850 and 1050                             b) Oil             530 – 560

c) Air

Tempreing Curve: