CoroMill® 326 Internal threading and chamfering in small holes Versatile and cost efficient, this miniature milling cutter benefits from three cutting edges for internal threading and chamfering. Designed for precision in small diameters, CoroMill® 326 delivers exceptional stability and surface quality in challenging applications. Application — Internal thread milling for V-profile 60º threads — Chamfering and back-chamfering of holes with one tool — Small diameter tools, down to 5.8 mm (0.228 inch) Features and benefits — Partial thread profiles for flexibility — Long reach, up to 35 mm (1.378 inch) — Three cutting edges for productivity — Very high precision and low cutting forces — Same tool for different pitches — One grade for all materials ISO application areas Precision where it matters The GC1025 grade brings sharp, consistent edges for secure and predictable machining, cut after cut. With a solid Weldon shank, you gain the stability and control that let your process run smoothly, even in tight spaces and demanding materials. 657