Iscar 3101940 Square-shoulder End Mill 1.25in HM90 E90A

Product Description

The ISCAR 3101940 is a square-shoulder indexable end mill in the HM90 E90A series, designed for 90-degree shoulder milling operations in metal cutting and machining applications. It features a 1.25-inch cutting diameter and accepts five indexable inserts secured by screw clamping. Maximum depth of cut reaches 0.394 inches, and the tool body is constructed from solid carbide. With an overall length of 3.5 inches and a Weldon flat shank measuring 0.75 inches in diameter, this cutter is built for rigid, repeatable setups on milling machines used in precision manufacturing environments.

This end mill is suited for square-shoulder face milling, slotting, and step milling on ferrous and non-ferrous materials in both job-shop and production settings. It is part of the Heli2000 series and carries a 90-degree lead angle, enabling true 90-degree walls in a single pass. The maximum ramping angle of 3 degrees supports helical interpolation entry. It is installed and operated by machinists and CNC programmers working on vertical machining centers and manual knee mills requiring a 3/4-inch Weldon flat toolholder.

Key Features

• 1.25-inch cutting diameter with 90-degree lead angle for true square shoulders
• Accepts five indexable inserts with screw-lock insert holding method
• Maximum depth of cut of 0.394 inches per pass
• Solid carbide tool body in the Heli2000 series for rigidity and vibration resistance
• 3/4-inch Weldon flat shank with 2.3-inch shank length for secure toolholder engagement
• Maximum ramping angle of 3 degrees for helical entry cuts

Compatibility

Designed for use with standard 3/4-inch Weldon flat toolholders on vertical machining centers and milling machines. Insert compatibility is specific to the HM90 E90A-10 cutter style within the ISCAR Heli2000 series. Verify insert grade and geometry selection against the specific workpiece material before use.

Installation Notes

Installation is performed by qualified machinists following standard toolholder and spindle lockout procedures before mounting or indexing inserts. Secure the Weldon flat shank fully into the toolholder and torque the setscrew per the toolholder manufacturer specification. Inspect each insert seat and clamping screw before use. Do not exceed the rated maximum depth of cut or ramping angle to avoid insert fracture or tool body damage.