The Carmex SRH Toolholder With Internal Coolant Bore (SRH28-3) is a versatile mounting solution for spiral mill-threading inserts. It is designed for both precise threading work on small components and demanding milling tasks on powerful machines, delivering efficient performance in a single, compact package.

Its spiral-fluted design enables smooth cutting at high feed rates while helping reduce overall machining time. The toolholder supports 1 to 9 inserts in a small cutting diameter and uses a unique clamping method to ensure optimal indexability, minimizing vibration and chatter across a wide range of materials. An internal coolant bore directs cooling fluid directly to the cutting edge, promoting consistent finishes, extended tool life, and reliable operation in threading, end milling roughing, and finishing applications. Inserts are MT7 Sub-Micron Grade with a Titanium Nitride multi-layer coating (ISO K10-K20), offering durable wear resistance across many materials.

• Spiral geometry for high-feed cutting: Enables smooth cutting at high feed rates and significantly reduces cycle times for both threading and milling tasks.
• Internal coolant bore for direct cooling: Delivers coolant straight to the cutting edge, enhancing tool life, reducing heat-related wear, and maintaining stable performance.
• Flexible insert capacity with reliable indexing: Holds 1–9 inserts in a compact diameter with a unique clamping method that ensures precise, repeatable indexability and consistent finishes using MT7 Sub-Micron TiN-coated inserts (ISO K10–K20).

Designed to streamline workflows, the SRH28-3 helps you finish complex threading and milling jobs faster while delivering high-quality surfaces. Its robust construction and intelligent insert economy reduce downtime and maintenance, giving you confident, repeatable results across a broad range of materials and applications.