Accupro 39461 Square End Mill 1/2 in 4 Flute Powdered Metal

Product Description

The ACCUPRO 39461 is a 4-flute square end mill designed for general-purpose milling operations in metal fabrication and machining environments. Built from powdered metal, this single-end tool features a spiral flute geometry with a 30-degree helix angle and right-hand cut with right-hand flute direction. The 0.5-inch mill diameter pairs with a 0.5-inch shank diameter, a 1.25-inch length of cut, and a 3.25-inch overall length. The centercutting design allows plunge entry directly into the workpiece, making it suitable for slot milling, profiling, and facing operations. This tool is uncoated and ships in single-unit packaging.

The 39461 is suited for use in manual mills, CNC machining centers, and knee mills where a standard 0.5-inch diameter square end mill is required. It is a common choice for shops working with steels, cast iron, and non-ferrous metals in both prototype and production runs. The 1.25-inch length of cut accommodates moderate-depth passes, while the 3.25-inch overall length fits standard toolholders and collet chucks without extended-reach adapters. Machinists and CNC operators in job shops, maintenance facilities, and manufacturing plants are the primary users.

Key Features

• Powdered metal construction provides consistent grain structure and edge retention compared to standard HSS
• 4-flute spiral design with 30-degree helix angle for smooth chip evacuation and surface finish
• Centercutting geometry enables direct plunge entry without a pre-drilled pilot hole
• Right-hand cut and right-hand flute direction — compatible with standard spindle rotation
• Uncoated finish suitable for use with cutting fluids and oils on a wide range of workpiece materials
• Mill diameter tolerance of +0.003 / -0.000 inches and shank diameter tolerance of -0.0001 / -0.0005 inches for precise fitment

Compatibility

Designed as a standard 0.5-inch shank square end mill compatible with ER collets, end mill holders, and side-lock holders commonly used in CNC machining centers and manual knee mills.

Installation Notes

Installation should be performed by a qualified machinist following the toolholder manufacturer torque and runout specifications. Ensure the spindle is fully stopped and the machine is powered down before inserting or removing the end mill. Confirm shank engagement depth meets the minimum grip length recommended by the toolholder manufacturer. Always verify tool runout with a dial indicator before beginning a cut to avoid premature edge wear or chatter.