Reduced shank drill bits Key benefits Fit larger-diameter cutters in standard chucks: the reduced shank design lets you clamp larger bits, taps, reamers or milling cutters in conventional drill chucks without special adaptors. Durable and wear-resistant: made from high-carbon bearing steel and heat treated to HRC 48°–50° for consistent hardness and long service life. Precise, low-runout performance: the inner bore is finished by high-precision grinding to DIN standard, improving concentricity and stable clamping. Smooth contact and consistent fit: surface roughness below RZ2.5 reduces friction at the bore and shank interface for reliable clamping and less vibration. Options for different needs: available in two product classes to match general and higher-precision applications. Material and performance Material: high-carbon bearing steel. Hardness: heat treated to HRC 48°–50°. Surface finish: roughness below RZ2.5. Inner bore: high-precision grinding according to DIN standard. Product range: two classes available for choice of tolerance/performance. Function and compatibility Purpose: reduced shank drill bits designed for clamping in chucks to hold screw taps, drills, milling cutters, reamers, and similar tools. Compatibility: works with standard drill chucks, tapping/clamping screws, and common machine tool holders that accept reduced-shank tooling. Use cases: suitable for both handheld and machine applications where a larger cutting tool must be held in a smaller or standard chuck. Practical applications (examples) Maintenance and repair: adapt a larger-diameter drill or reamer to a shop drill or portable drill for on-site hole enlargement or alignment work. Toolroom and prototyping: hold milling cutters or reamers in a standard chuck for light machining, deburring, and finishing operations without changing collets or holders. Threading and tapping: secure taps with the reduced shank adapter in a chuck for controlled thread cutting in fixtures, jigs, or portable machines. What this solves Eliminates the need for special chucks or collet changes when using larger cutters. Reduces runout and vibration compared with poorly fitted adapters, improving hole quality and tool life. Provides a durable, standardized option (DIN-ground bore) for repeatable, reliable clamping across production and maintenance tasks. Ordering notes Available in two product classes; specify the required class when ordering to match precision and tolerance needs. Material and heat-treatment specifications: high-carbon bearing steel, HRC 48°–50°; surface roughness < RZ2.5; inner bore ground to DIN standard. Use this reduced shank drill bit set when you need reliable clamping of larger cutting tools in standard chucks with improved concentricity, durability, and consistent surface finish.