Sandvik Coromant 5739666 Square Shoulder End Mill 2.5 in

Product Description

The SANDVIK COROMANT 5739666 is an indexable square-shoulder end mill designed for precision shoulder milling and ramping operations on machining centers and milling machines. Built to the CoroMill 390 platform, this tool accepts 21 R390-18 series inserts secured by screw-type insert holding, ensuring consistent cutting geometry across the full 2.5-inch cutting diameter. The tool features through-coolant capability, directing coolant directly to the cutting zone to extend insert life and manage chip evacuation in deep-reach applications. With a 90-degree lead angle and a maximum depth of cut of 3.93 inches, it is suited for full-depth shoulder passes in a single operation. Steel body construction keeps weight manageable at 6.57 pounds.

This end mill is intended for industrial metalworking environments where square-shoulder profiling, pocket milling, or step milling is required. The C6 modular connection shank integrates directly with compatible modular tooling systems, allowing tool length adjustment and reducing the need for custom extensions. With a maximum spindle speed of 6800 RPM and three flute positions, it balances productivity with stability in both roughing and semi-finishing passes. It is typically installed and set up by CNC machinists and tooling engineers in job shop and production manufacturing settings.

Key Features

• 2.5-inch cutting diameter with 90-degree lead angle for true square-shoulder milling
• Maximum depth of cut of 3.93 inches enables deep shoulder passes in a single setup
• Through-coolant design directs fluid to the cutting edge for improved insert life and chip control
• Accepts 21 R390-18 series indexable inserts held by screw-type clamping
• C6 modular connection shank for compatibility with modular tooling systems
• Maximum spindle speed of 6800 RPM supports productive feed rates in steel and similar materials

Compatibility

Designed for use with R390-18 series indexable inserts. Compatible with tooling systems that accept a C6 modular connection shank. Verify spindle interface and modular adapter compatibility before installation.

Installation Notes

Installation should be performed by a qualified CNC machinist or tooling engineer. Power down and lock out the machine spindle before mounting or removing the tool body or inserts. Torque insert screws using the appropriate Torx key as specified by the insert manufacturer documentation for the R390-18 insert series. Confirm modular connection engagement and runout with a dial indicator before initiating a cutting program.