Introducing the Carmex SR0021M21C — a single long carbide shank threading insert holder designed for CNC milling that handles both external and internal threading with precision. Built for long overhangs, it delivers reliable reach and consistent results in demanding machining environments.

• Internal coolant bore: Integrated coolant channel directs coolant to the cutting edge for better chip control and extended insert life.
• Long reach capability: Overall length up to 270 mm (metric versions) / 10.5 inches (inch versions) to access deep features without repositioning the workpiece.
• Carbide shank construction: Rugged carbide body provides rigidity, stable seating, and repeatable threading accuracy across jobs.
• Compatibility with carbide threading inserts: Specifically designed to support carbide external and internal threading inserts for versatile applications.
• Metric and inch versions: Available in both metric (up to 270 mm) and inch (up to 10.5") lengths to fit global machining setups.
• Cost-effective threading solution: A practical alternative to taps and dies, helping reduce tooling costs on high-volume threading tasks.
• Helical interpolation-ready: Optimized for CNC milling with helical interpolation to produce precise threads efficiently.
• Operational guidance for long overhangs: When machining long overhangs, reduce cutting speed and feed rate by 20–40% depending on material, pitch, and overhang to maintain stability and tool life.

The SR0021M21C is ideal for shops that frequently perform threaded features in hard-to-reach areas—think automotive housings, hydraulic components, and aerospace fittings. By combining a robust carbide shank, long-reach design, and integrated coolant, this holder enables faster cycles, consistent thread quality, and simpler inventory management, all while offering a lower total cost of ownership compared with traditional threading taps and dies. Its design supports both external and internal carbide inserts, giving you flexibility across a range of threading tasks without swapping tools.