Precision tool-holding components compatible with ISO15, ISO20, ISO25, ER11, ER16, ER20, ER25 and SK10 configurations. Designed to deliver repeatable clamping, high-speed balance and long-term durability for machining and milling applications. Key benefits Reliable concentricity: 0.002 mm runout accuracy ensures consistent cut quality, reduced part scrap and predictable tool life. High-speed capability: Balanced to G2.0 and rated up to 40,000 rpm for demanding high-speed machining and micro-milling operations. Durable construction: Made from 4Cr13 steel with a hardened surface (HRC 51–53) and carburizing depth > 0.8 mm to resist wear and maintain clamping precision over time. Broad compatibility: Available in common ISO, ER and SK specifications (ISO15 / ISO20 / ISO25 / ER11 / ER16 / ER20 / ER25 / SK10) to match a wide range of spindles and collets. Stable performance: Combines hardness and surface treatment to reduce deformation under load and maintain concentricity during extended runs. Technical specifications Models: ISO15, ISO20, ISO25, ER11, ER16, ER20, ER25, SK10 Material: 4Cr13 Accuracy (runout): 0.002 mm Balance grade / max speed: G2.0, up to 40,000 rpm Hardness: HRC 51–53 Carburizing depth: > 0.8 mm Typical applications / scenarios High-speed milling: Use in CNC machining centers for precision surface finishing and micro-milling where low runout and high rpm are required. Small-diameter tool work: Ideal for operations with ER-series collets (ER11–ER25) to hold small end mills, drills and reamers with minimal vibration. Production runs: Suitable for repetitive manufacturing where consistent tool clamping and wear resistance reduce setup time and part variation. Why choose this product Matches industry-standard sizes for easy integration into existing tooling setups. Built to maintain precision under high speed and repeated use, helping reduce downtime and tooling costs. Clear, measurable specifications (accuracy, hardness, balance and carburizing depth) allow confident selection for applications where tolerance and longevity matter.