Sandvik Coromant 5740039 Square Shoulder End Mill

Product Description

The SANDVIK COROMANT 5740039 is an indexable square-shoulder end mill from the CoroMill 390 series, designed for high-precision milling operations in metal cutting environments. Built with a steel body and a 1.5 inch cutting diameter, it accepts three R390-17 series indexable inserts secured by screws. The 90-degree lead angle delivers true square shoulders in a single pass. Through-coolant capability directs fluid directly to the cutting zone, extending insert life and improving chip evacuation during demanding cuts. This tool is installed and operated by machinists and CNC tooling specialists in production and job-shop settings.

The 5740039 is suited for square-shoulder milling, ramping, and peripheral milling applications on steel, stainless, cast iron, and non-ferrous materials. With a maximum depth of cut of 15.7 mm (0.618 inches) and an overall length of 4.5 inches, it fits standard vertical machining centers and milling machines using a 1.25 inch Weldon flat shank interface. The three-flute configuration balances material removal rate with chip clearance. Maximum spindle speed is rated at 22,700 RPM, making it compatible with high-speed machining programs.

Key Features

• 1.5 inch cutting diameter with 90-degree lead angle for true square-shoulder profiles
• Accepts three R390-17 series indexable inserts, screw-mounted for repeatable positioning
• Through-coolant design improves chip removal and insert longevity at high feed rates
• Weldon flat shank at 1.25 inches diameter provides secure tool holding in standard milling chucks
• Ramping capability allows plunge entry at angle without dedicated drilling operations
• Maximum spindle speed of 22,700 RPM supports high-speed machining center programs

Compatibility

Compatible with R390-17 series indexable inserts. Designed for use in machining centers and milling machines equipped with Weldon flat tool holders sized for a 1.25 inch shank diameter.

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling specialist. Ensure the spindle is fully powered down and locked out before mounting or changing inserts. Torque insert screws using the appropriate Torx or hex key as specified by the insert manufacturer documentation supplied with the inserts. Confirm tool runout with a dial indicator after mounting and before initiating a cutting program to prevent premature insert wear or tool body damage.