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 K137 is a universally applicable, ledeburitic 12% chromium steel featuring excellent wear resistance and good toughness. The steel is suitable for air hardening and shows good dimensional stability..
Read MoreBÖHLER K340 ECOSTAR belongs to the group of conventionally produced 8% chromium steels. Compared to conventional 12% chromium steels, this conventionally smelted tool steel has better toughness, hardening response and higher adhesive wear resistance. This combination of high adhesive wear resistance and toughness also offers advantages for industrial knives subject to high stress. This grade is also used for stamping and cutting tools.
Read MoreBÖHLER K340 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. Compared to conventional 12% chromium steels, BÖHLER K340 ISODUR offers significantly better toughness, hardening response and higher resistance to adhesive wear. This material is therefore used in virtually all cold work applications in situations where tool steels like 1.2379 are insufficient in terms of adhesive wear resistance and toughness. K340 ISODUR also features better machinability and reduces the risk of stress cracking during electrical discharge machining.
Read MoreBÖHLER K346 belongs to the group of conventionally produced 8% chromium steels. Its alloy composition features a high content of molybdenum, tungsten and vanadium, which makes BÖHLER K346 more wear resistant and tougher than conventional 12% chromium steels (1.2080, 1.2379). BÖHLER K346 is used in situations where materials like 1.2379 are insufficient in terms of toughness and where high requirements for abrasive wear resistance are set. This combination of high wear resistance and toughness offers advantages for industrial knives subject to high stress in the recycling industry. This grade is also used for stamping and cutting tools.
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 K490 MICROCLEAN is a high-performance cold work tool steel with a balanced property profile, manufactured using powder metallurgy. This powder metallurgical tool steel offers an outstanding combination of high wear resistance, compressive strength, toughness and very good machinability. Thanks to the resulting flexibility, BÖHLER K490 MICROCLEAN is used in virtually all cold work applications, and in many cases this material is the first choice for newly developed tools. The commonly used hardening temperatures of BÖHLER K490 MICROCLEAN also enable shared heat treatment with popular cold work tool steels (1.2379, D2), making it very economical in terms of heat treatment.
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.
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