Reduced Shank Drill Bits Key benefits Durable, wear-resistant construction: made from high-carbon bearing steel and heat treated to HRC 48-50 for long service life under repeated use. Precise, repeatable fit: inner bore is finished by high-precision grinding to DIN standards for consistent clamping and concentricity. Smooth surface finish: surface roughness below RZ2.5 reduces friction and improves tool seating and handling. Broad compatibility: reduced shank design supports use in chucks and holders that accept smaller shank diameters, increasing flexibility of use. Available choices: offered in two product classes to match different tolerances and application needs. Specifications Product type: Reduced shank drill bits Material: High-carbon bearing steel Hardness: Heat treated to HRC 48-50 Surface finish: Surface roughness below RZ2.5 Inner bore: High-precision grinding, processed to DIN standard Variants: Two product classes available Functions and compatibility Designed for clamping screw tap, drill, milling cutter, reamer and so on. Suitable for use in standard chucks and holders that accept the reduced shank. Provides reliable mechanical clamping and stable rotation for downstream tooling operations. Typical applications Machine shop drilling and reaming where larger bit diameters must be used in existing smaller chucks or collets. Maintenance and repair work that requires quick tool changes and reliable clamping of taps, drills, milling cutters, or reamers. Production setups that need consistent concentricity and surface finish for precision holemaking. What to expect Consistent fit and runout control thanks to DIN-standard inner bore grinding. Robust performance and longer life from heat-treated high-carbon bearing steel at HRC 48-50. Choice of two product classes to balance cost and precision for your specific application.