Accupro 40279903 Square-shoulder Face Mill 2.5in 6 Flute

Product Description

The ACCUPRO 40279903 is an indexable square-shoulder face mill designed for precision metal-removal operations on CNC machining centers and milling machines. Built from steel with a 2.5-inch cutting diameter and a maximum depth of cut of 0.47 inches, this cutter accepts six LOKU 552 or LNKU 553 inserts secured by screw-lock retention. The 0 degree lead angle (90-degree approach) produces true square shoulders in a single pass. Positive rake geometry reduces cutting forces and heat buildup, making this mill a reliable choice for production environments where tool life and surface finish matter. Coolant-through capability is standard on this body.

This face mill is suited for steel, cast iron, and similar workpiece materials in both job-shop and high-volume production settings. Rated to 13,300 RPM, the CI-series ADSM-style cutter handles facing, shouldering, slotting, helical interpolation, ramping, and plunging operations. The 0.75-inch arbor hole fits standard arbor toolholding systems common to most vertical and horizontal milling setups. With six cutting edges in a compact 2.5-inch body, chip load per tooth can be distributed efficiently across a wide range of feed rates.

Key Features

• 2.5-inch cutting diameter with 0.47-inch maximum depth of cut for square-shoulder profiling
• Six-insert, six-flute configuration for balanced cutting forces and high metal-removal rates
• Compatible with LOKU 552 and LNKU 553 indexable inserts, insert size code 12
• Screw-lock insert retention for positive seating and repeatable edge positioning
• Coolant-through body design directs fluid directly to the cutting zone
• Positive rake geometry at a 0-degree/90-degree lead angle for clean square shoulders
• Maximum spindle speed of 13,300 RPM supports high-speed milling applications

Compatibility

Compatible with LOKU 552 and LNKU 553 indexable inserts (insert size code 12). Fits 0.75-inch arbor toolholding systems. Designed for use in CNC vertical and horizontal milling machines capable of accepting arbor-style face mill bodies.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Power down and lock out the spindle before mounting or indexing inserts. Confirm arbor runout is within machine specifications before taking the first cut, as excessive runout accelerates insert wear and degrades surface finish. Use a torque wrench appropriate for insert screw size when seating inserts to ensure consistent clamping force.