Thread rolling forms threads by cold‑deforming steel, aluminum, or titanium with hardened dies. The chipless process creates strong, fatigue‑resistant threads for bolts, screws, studs, automotive and aerospace parts with high accuracy and production efficiency.
Thread rolling is a chipless cold‑forming process used to create external threads by plastically deforming material between hardened dies. Unlike cutting, rolling displaces material to form the thread profile, producing stronger surfaces with improved fatigue resistance due to work hardening and compressive residual stresses. The process is performed at room temperature on ductile materials such as carbon and alloy steels, stainless steels, aluminum, copper alloys, and titanium grades suited for cold deformation. Tooling includes flat dies, cylindrical dies, or planetary dies made from high‑speed steel and Cold Work Tool Steels or Cemented Carbide, engineered with precise thread geometry and surface treatments to endure high contact pressures. Proper lubrication, alignment, and feed settings ensure accurate pitch, flank angles, and surface finish. Thread rolling is widely used for fasteners, bolts, screws, studs, automotive drivetrain components, aerospace fittings, and medical implants, offering high production rates, excellent repeatability, and superior mechanical performance compared to cut threads.
BÖHLER K110 is a 12% ledeburitic chromium steel and corresponds to material number 1.2379 (X153CrMoV12, D2). This tool steel combines the advantages of conventional 12% ledeburitic chromium steels with those of advanced tool steels. In the group of 12% ledeburitic chromium steels, BÖHLER K110 offers the best combination of wear resistance, compressive strength and toughness, for which reason it is used in virtually all cold work applications. Its advantageous tempering behavior with a pronounced secondary hardness maximum also enables the use of advanced coatings. This also makes BÖHLER K110 suitable for complex tools requiring a high degree of dimensional stability and shape stability.
Read MoreBÖHLER K360 ISODUR belongs to the group of 8% chromium steels. This tool steel is produced using the electro-slag remelting (ESR) process developed by BÖHLER. This re-melting technology ensures the lowest micro and macro segregation as well as excellent purity and uniformity of the material. The alloy composition with higher molybdenum and vanadium content makes BÖHLER K360 ISODUR even more wear resistant than BÖHLER K340 ISODUR. Compared to tool steels like 1.2379 (D2), this combination of better toughness and wear resistance offers significant advantages for punching and cutting tools.
Read MoreBÖHLER K390 MICROCLEAN is a high-alloyed, high-performance cold work tool steel manufactured using powder metallurgy. This material has the highest alloy content in the group of cold work tool steels with high vanadium content. The high alloy content gives this material outstanding wear resistance. At the same time, the powder metallurgical manufacturing process creates a uniform matrix with finely distributed primary carbides. Among other things, this leads to good material toughness. BÖHLER K390 MICROCLEAN is a problem solver for applications requiring extremely high wear resistance and compressive strength.
Read MoreBÖHLER S401 – “The conventional” This grade is part of the family of molybdenum-alloyed high-speed steels and its winning performance is matched by its good cost effectiveness.
Read MoreBÖHLER S500 – “The fireproof one” In the family of conventional high-speed steels, this alloy combines excellent cutting properties with very high hot hardness.
Read MoreBÖHLER S600 – “The high-speed steel” Ideal for mills, twist drills, and taps, broaches, cold-work tools. BÖHLER S600 is the most commonly used high-speed steel and is the starting material for our customers who deal with high-speed steel.
Read MoreBÖHLER S630 – “The economical one” Tungsten-molybdenum high-speed steel with aluminum alloy for great toughness and good machinability. Universally usable for taps and twist drills, reamers, metal saws, mills of all types, and woodworking tools.
Read MoreUddeholm Sleipner is a general purpose steel for cold work tooling. It has a mixed-abrasive wear profile and a good resistance to chipping. Furthermore a high hardness (>60 HRC) can be obtained after high temperature tempering. This means that surface treatments such as nitriding or PVD can be made on a high strength substrate. Also, it means that complicated shapes with hardness levels >60 HRC can be wire EDM’d from blocks with relatively thick cross-sections with a much reduced risk of cracking. Uddeholm Sleipner is recommended for medium run tooling applications where a resistance to mixed or abrasive wear and a good resistance to chipping are required. Benefits Very broad property profile Very good steel for all types of surface treatments Extremely versatile conventional tool steel for medium run cold work tooling Suitable upgrade where added chipping or wear resistance is needed over traditional AISI A2 or AISI D2 In East/South East Asian countries served by ASSAB, Uddeholm Sleipner is sold as ASSAB 88.
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