Seco 02765298 Thread Mill 5/16-24 Unf Internal 3 Flute

Product Description

The SECO 02765298 is a solid carbide helical flute thread mill designed for cutting internal UNF threads to a 5/16-24 specification. The tool features three right-hand flutes and a coolant-through design, supporting chip evacuation and tool life in demanding machining environments. With a 0.315-inch shank diameter and a 0.244-inch cutting diameter, this thread mill is suited for CNC machining centers where single-tool thread milling is preferred over tapping. It is installed by machining professionals in job shop, production, and maintenance repair operations.

This thread mill is used in applications requiring precise internal UNF thread generation, particularly where tap breakage risk is a concern or where a single tool must handle a range of thread depths. The 0.646-inch length of cut accommodates standard thread depths for 5/16-24 fastener applications. The 2.441-inch overall length provides clearance for most standard toolholders. Coolant-through capability makes it well suited for harder workpiece materials where heat management is critical.

Key Features

• Solid carbide construction for rigidity and wear resistance in precision thread milling
• Three right-hand helical flutes for balanced cutting action and chip flow
• Coolant-through design supports chip evacuation and thermal control
• 0.315-inch shank diameter compatible with standard ER and shrink-fit toolholders
• 24 TPI UNF thread form for internal 5/16-24 thread applications
• Single-tool solution eliminates the need for multiple tap sizes at this thread specification

Compatibility

Designed for use in CNC machining centers capable of helical interpolation for internal thread milling of 5/16-24 UNF threads. Minimum nominal bore diameter for this application is 0.3125 inches.

Installation Notes

Thread milling requires a CNC control capable of helical interpolation; verify programmed toolpath direction matches the right-hand flute orientation before cutting. Secure the shank fully in a balanced toolholder and confirm runout is within tolerance before engaging the workpiece. Power down and lock out the spindle before any tool change. Follow shop-specific speeds and feeds for solid carbide tooling based on workpiece material.