Seco 02688855 Square-shoulder End Mill 1-1/4 in 3 Flute

Product Description

The SECO 02688855 is an indexable square-shoulder end mill from the Super Turbo series, designed for precision milling operations in metalworking and machining applications. Built around a cylindrical shank design, it accepts three XO.X 1204.. screw-held inserts and delivers a 90-degree lead angle for true square shoulders. With a cutting diameter of 1.25 inches, a maximum depth of cut of 0.433 inches, and a maximum spindle speed of 18,400 RPM, this tool is suited for demanding material removal on CNC milling machines. The through-coolant feature directs fluid directly to the cutting zone, extending insert life and improving chip evacuation in high-feed passes.

This end mill is intended for professional machinists and tooling technicians operating CNC vertical and horizontal milling centers. It is well-suited for square-shoulder profiling, slotting, and face milling operations in production and job-shop environments. The 1.25-inch cylindrical shank fits standard collet chucks and end mill holders sized for that bore diameter. The 7.69-inch overall length provides reach for deeper cavity work while the 6.10-inch shank length allows secure gripping in the spindle. Insert indexing is fast and repeatable, keeping downtime low during long production runs.

Key Features

• 1.25-inch cutting diameter with 0.433-inch maximum depth of cut for square-shoulder milling
• 3-insert configuration using XO.X 1204.. inserts secured by screw clamping
• 90-degree lead angle produces true square shoulders and perpendicular walls
• Through-coolant capability improves chip evacuation and insert longevity
• Maximum spindle speed of 18,400 RPM supports high-productivity cutting conditions
• Super Turbo series cutter style R217.69-12A for consistent indexable performance

Compatibility

Accepts three XO.X 1204.. series inserts secured by screw clamping. The 1.25-inch cylindrical shank is compatible with standard end mill holders and collet chucks designed for 1-1/4-inch bore diameters.

Installation Notes

Installation and tool changes should be performed by qualified machinists or tooling technicians with the spindle fully stopped and the machine in a locked-out, de-energized state per facility lockout-tagout procedures. Torque insert screws using the correct Torx or hex key supplied or recommended by the tooling manufacturer. Verify shank seating depth and runout with a dial indicator before commencing a cut. Inspect insert seats and clamping screws for wear or debris before each insert change.