Tool holders are defined as a mechanical or structural system used to securely hold, align, and support tools, dies, or molds in manufacturing processes, ensuring stability, precision, and efficient force or energy transfer. Tool holders are mainly used in classical machining operation but the concept is frequently extended to other tool based industries such as cold working, hot working and plastic processing, where tool holders broadly describe systems that support and fix functional tooling components.
Tool holders are precision interfaces used in machining to secure cutting tools and transfer torque, feed forces, and rotational accuracy from the machine spindle to the tool. They play a critical role in stability, runout control, and vibration reduction. Common systems include HSK (hollow‑shank tool holder system), BT-taper, CAT(American steep taper concept), SK (German steep taper), and straight‑shank holders, depending on machine type and speed. Materials typically involve alloy steels and alloyed tool steels, case‑hardened tool steels, and balanced designs for high‑speed machining. Tooling configurations range from collet chucks, hydraulic and shrink‑fit holders to modular systems and indexable tool bodies. Clamping technologies determine rigidity—shrink‑fit holders offer high concentricity, hydraulic holders provide damping, and collet systems allow flexibility. Tool holders must maintain precise taper contact, dynamic balance, and coolant delivery through channels or ports. Applications include milling, drilling, reaming, tapping, and high‑performance CNC machining in automotive, aerospace, mouldmaking, energy, and general industrial manufacturing, where accuracy and repeatability are essential.
BÖHLER K305 belongs to the group of 5% chromium steels and corresponds to the material 1.2363 (X100CrMoV5, A2). Compared to conventional tool steels with 1% carbon and low chromium content, BÖHLER K305 has significantly better through hardenability and wear resistance. This class of 5% chromium steels is used in situations where grades like 1.2842 are no longer sufficient in terms of wear resistance and through hardenability but materials like 1.2379 are not yet required. BÖHLER K305 is used for punching and cutting tools, die plates and inserts, thread cutting tools and machine knives in the wood, paper and recycling industries.
Read MoreBÖHLER K460 corresponds to the material 1.2510 (100MnCrW4, O1) and has comparable properties to the popular tool steel 1.2842. Additional alloying with tungsten achieves higher resistance to abrasive wear compared to the tool steel 1.2842. BÖHLER K460 offers the advantage of simple heat treatment with low hardening temperatures and single tempering. However, this characteristic tempering behaviour limits the use of advanced coatings. The material has a good hardening response, but only moderate through hardenability. BÖHLER K460 is used for punching and cutting tools, plastic molds, thread cutting tools and machine knives in the wood, paper and recycling industries.
Read MoreBÖHLER M200 is a prehardened, non-corrosion-resistant chromium-manganese-molybdenum alloyed plastic mould steel with very good machinability and uniform strength over the entire cross-section of medium-sized dimensions.
Read MoreBÖHLER M315 is a prehardened, corrosion-resistant martensitic plastic mold steel. Due to its chemical composition, BÖHLER M315 has improved machinability compared to 1.2085 and is approved for food contact.
Read MoreBÖHLER W302 ISOBLOC is a 5% chromium steel and corresponds to material number 1.2344 (X40CrMoV5-1). Produced via the electroslag remelting process (ESR), this tool steel has very high hot toughness as well as very high hot hardness and a very good resistance against heat-checkings. The combination of these properties makes it a top performer in closed- and open-die forging as well as in high- and low-pressure die casting. In addition, this material has very good polishability and is therefore also often used as a molding material for plastic injection molds.
Read MoreBÖHLER W302 ISODISC is a 5% chromium steel and corresponds to material number 1.2344 (X40CrMoV5-1). This common tool steel has good hot toughness as well as a high hot hardness and a high resistance against heat-checkings. The combination of these properties makes it a standard choice in extrusion, forging and low-pressure die casting. This material is also available as W302 ISOBLOC which is a remelted grade with improved cleanliness, homogeneity and toughness.
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