Iscar 5621957 Square End Mill 3/8 in 6 Flute Solid Carbide

Product Description

The ISCAR 5621957 is a solid carbide square end mill engineered for high-performance milling across a broad range of workpiece materials. It features a 3/8 inch diameter, a 7/8 inch length of cut, and a 6-flute configuration with a 45-degree helix angle. The TiAlN coating provides heat and oxidation resistance, making this tool well suited for demanding cutting applications. The IC903 material grade is designed to maintain edge integrity under elevated cutting temperatures. This end mill is a single-end tool with a straight cylindrical shank and right-hand cutting and flute direction, intended for installation in standard milling machine or machining center tool holders.

This end mill is applicable across multiple workpiece material categories, including hardened steels, cast irons, stainless steels, carbon and alloy steels, and high-temperature superalloys, as indicated by material codes H, K, M, P, and S. It is suited for slot milling, peripheral milling, and finishing passes in both CNC machining centers and manual knee mills. The regular-length geometry and 3 inch overall length make it a practical choice for general-purpose and production milling operations. It is not center-cutting, so plunge entry is not recommended without a pilot hole or ramping strategy.

Key Features

• Solid carbide construction with IC903 grade for elevated cutting temperature resistance
• TiAlN coating for extended tool life in high-speed and dry machining applications
• 6 flutes with 45-degree spiral helix for improved chip evacuation and surface finish
• Right-hand cut and right-hand flute direction for standard milling spindle compatibility
• 3/8 inch straight cylindrical shank fits standard collets and end mill holders
• Not center-cutting — plunge milling requires an alternative entry strategy

Compatibility

Compatible with workpiece material categories H, K, M, P, and S as specified by the manufacturer, covering hardened steels, cast irons, stainless steels, steels, and superalloys. Designed for use in standard 3/8 inch collet chucks, end mill holders, or shrink-fit holders on CNC machining centers and milling machines.

Installation Notes

Installation is performed by machinists and CNC setup technicians. Ensure the tool holder and spindle taper are clean and free of chips before seating the shank. Verify runout with a dial indicator after clamping, as excessive runout reduces tool life on multi-flute carbide end mills. Follow the machine manufacturer and tooling manufacturer guidelines for speeds, feeds, and depth of cut before beginning the operation.