Accupro 39519 Square End Mill 5/16 in 3 Flute Powdered Metal

Product Description

The ACCUPRO 39519 is a single-end square end mill designed for general-purpose milling operations in ferrous and non-ferrous materials. The tool measures 5/16 inch in diameter with a 3/4 inch length of cut, a 3/8 inch shank diameter, and a 2-1/2 inch overall length. Manufactured from powdered metal, it delivers a balance of toughness and wear resistance suited to production and maintenance machining environments. Three right-hand spiral flutes with a 45-degree helix angle promote efficient chip evacuation and reduce cutting forces. The centercutting geometry allows plunge milling in addition to peripheral and slot cuts. This end mill ships uncoated and is intended for machinists and tool-and-die professionals working with manual or CNC milling equipment.

This end mill fits residential and commercial machine shop applications including CNC machining centers, knee mills, and bridgeport-style vertical mills. It is well suited for profiling, slotting, contouring, and plunge cuts in steel, cast iron, aluminum, and similar machinable materials. The 3-flute design offers a middle ground between chip clearance and surface finish, making it a practical choice for both roughing passes and semi-finish work where a single tool handles multiple operations.

Key Features

• 5/16 inch cutting diameter with a mill diameter tolerance of plus 0.003 / minus 0.000 inches for consistent fit
• Three right-hand spiral flutes at a 45-degree helix angle for aggressive chip evacuation
• Centercutting design enables direct plunge entry without a pilot hole
• 3/8 inch shank diameter with a shank tolerance of minus 0.0001 / minus 0.0005 inches for secure collet or chuck grip
• Powdered metal construction provides improved toughness over standard high-speed steel
• Uncoated finish — compatible with cutting fluids and lubricants suited to the workpiece material

Compatibility

Designed as a standard single-end square end mill for use in any milling machine or machining center accepting a 3/8 inch straight shank via collet, end mill holder, or set-screw adapter.

Installation Notes

Installation should be performed by a qualified machinist following shop safety procedures. Ensure the spindle is fully stopped and the machine is powered down before changing tooling. Verify the collet or tool holder bore matches the 3/8 inch shank diameter before tightening. Check runout at the cutting end after securing the tool to minimize premature wear and maintain dimensional accuracy.