Value Collection -20550-4 Square End Mill 1/4 in 4 Flute Hss

Product Description

The VALUE COLLECTION -20550-4 is a single-end, 4-flute square end mill designed for general-purpose milling operations in machine shops and on the shop floor. Built from high speed steel (HSS) with a titanium nitride (TiN) coating, it offers improved surface hardness and wear resistance compared to uncoated HSS tooling. The cutting diameter is 0.25 inches (1/4 inch), the length of cut is 0.625 inches (5/8 inch), and the overall length is 2.4375 inches (2-7/16 inches). The 3/8-inch shank diameter makes it compatible with standard collets and end mill holders. This tool is sold as a single unit.

This end mill is suited for slotting, profiling, and peripheral milling in ferrous and non-ferrous materials. The 30-degree right-hand spiral flute geometry promotes efficient chip evacuation and helps reduce heat buildup during cutting. Center-cutting capability allows plunge entry into the workpiece, adding flexibility to the machining setup. It is a regular-length tool appropriate for everyday milling tasks where extended reach is not required. Machinists, tool-and-die makers, and CNC operators working in job shops or maintenance environments are the primary users.

Key Features

• 0.25-inch (1/4 inch) cutting diameter with 0.625-inch length of cut
• High speed steel construction with titanium nitride (TiN) coating for extended tool life
• 4-flute, right-hand spiral design at 30-degree helix angle for efficient chip removal
• Center-cutting geometry allows direct plunge entry
• 3/8-inch shank diameter fits standard collets and end mill holders
• Single-end, regular-length configuration for general milling applications

Compatibility

Designed as a standard single-end square end mill for use in CNC machining centers, knee mills, and manual milling machines equipped with a 3/8-inch collet or end mill holder.

Installation Notes

Installation is performed by a machinist or CNC operator. Ensure the machine spindle is fully stopped and locked out before changing tooling. Seat the shank fully and evenly in the collet or holder and torque the drawbar or collet nut to the machine manufacturer's specification. Inspect the TiN coating and cutting edges for chips or wear before each use — damaged tooling should be replaced before running.