Reduced Shank Drill Bits Key benefits High strength and wear resistance: made from high-carbon bearing steel and heat treated to HRC 48–50 for long tool life and reliable performance under load. Precise concentricity and low runout: the inner bore is finished by high-precision grinding according to DIN standards, improving tool holding accuracy and reducing vibration. Smooth surface finish: surface roughness is below RZ 2.5, available in two product classes to match your tolerance and finish requirements. Versatile compatibility: reduced shank design lets you use larger-diameter tools in standard chucks or holders, increasing flexibility without changing machines. Stable clamping: engineered for secure holding of taps, drills, milling cutters, reamers and similar tools, reducing slippage and improving machining consistency. How this solves common problems Eliminates poor tool holding and runout that cause broken tools, oversized holes, or bad surface finishes by combining precision grinding and strict heat treatment. Reduces downtime and replacement cost thanks to higher wear resistance (HRC 48–50) and a smooth surface that resists fretting and galling. Allows you to adapt larger tools to existing equipment quickly and safely, avoiding the need for new specialized chucks or adapters. Where it performs best (practical applications) On-site or shop drilling where a larger-diameter hole is required but only a standard drill chuck is available — use the reduced shank bit to complete the job without changing equipment. Toolroom and maintenance work where precise tapping, reaming, or milling operations require low runout and repeatable clamping accuracy. Production or assembly lines that need interchangeable tool holding for drills, taps, milling cutters and reamers to speed changeover while maintaining consistent part quality. Specifications (as supplied) Product: Reduced shank drill bits Material: High-carbon bearing steel Hardness: HRC 48–50 (heat treated) Surface roughness: < RZ 2.5; available in two product classes Inner bore processing: High-precision grinding according to DIN standard Intended use: Clamping screw, tap, drill, milling cutter, reamer, and similar tooling Recommended user notes Confirm shank/chuck compatibility and clamping method before use. Use appropriate cutting speeds, feeds, and coolant for material being machined to maximize tool life. Inspect clamping surfaces for cleanliness and damage to maintain precision and prevent slippage.