Kennametal 3742556 Square-shoulder End Mill 1 in 4 Flute

Product Description

The KENNAMETAL 3742556 is an indexable square-shoulder end mill designed for high-productivity milling operations in ferrous and non-ferrous materials. Built around ISO designation M1D100E1004W100L125, this tool accepts four EC10 and EP10 series inserts secured by a screw-holding method, enabling fast insert changes without removing the body from the machine. The 1-inch cutting diameter, 0-degree lead angle, and 0.395-inch maximum depth of cut produce true 90-degree shoulder walls in a single pass. Through-coolant capability via a 0.236-inch internal coolant passage keeps cutting edges cool and evacuates chips at elevated feed rates.

This end mill is suited for CNC machining centers performing square-shoulder milling, slot milling, and ramping operations in job-shop and production environments. The Weldon flat shank with a 1-inch diameter provides positive drive and secure retention in standard Weldon-style end mill holders. With a maximum spindle speed of 39,700 RPM, the tool supports both conventional and high-speed machining strategies. It is appropriate for use in both horizontal and vertical machining centers wherever a rigid, repeatable shoulder-milling solution is required.

Key Features

• 1-inch cutting diameter with 0-degree lead angle for true 90-degree shoulder walls
• Accepts four EC10 and EP10 series indexable inserts with screw-lock retention
• Through-coolant passage of 0.236 inches for chip evacuation and edge cooling
• Maximum spindle speed of 39,700 RPM supports high-speed machining strategies
• Weldon flat shank provides positive drive and eliminates pullout under heavy cuts
• 0.395-inch maximum depth of cut enables full-width shoulder passes in one step

Compatibility

Compatible with EC10 and EP10 series indexable inserts. Fits standard Weldon-style end mill holders with a 1-inch bore. Designed as an OEM-style replacement or direct-use tooling body identified by ISO number M1D100E1004W100L125.

Installation Notes

Installation should be performed by a qualified CNC machinist or tooling technician. Ensure the machine spindle is fully stopped and the controller is in an E-stop or locked-out state before mounting or changing inserts. Seat the Weldon flat shank fully into the holder and torque the set screw to the holder manufacturer's specification. Verify insert seating and screw torque against KENNAMETAL tooling documentation before initiating a cutting cycle.