Accupro 39458 Square End Mill 5/16 in 4 Flute Powdered Metal

Product Description

The ACCUPRO 39458 is a single-end square end mill designed for general-purpose milling operations in a wide range of ferrous and non-ferrous materials. It features a 5/16-inch cutting diameter, a 3/4-inch length of cut, and a 3/8-inch shank diameter, with an overall length of 2.5 inches. Constructed from powdered metal, this end mill delivers consistent hardness and wear resistance across the cutting edge. The uncoated finish makes it suitable for applications where coating compatibility or regrinding is a consideration. With four spiral flutes and a 30-degree helix angle, it is engineered for efficient chip evacuation and smooth cutting action in standard milling setups.

This end mill is used in vertical milling machines, CNC machining centers, and manual knee mills for slotting, profiling, and peripheral milling. Its centercutting capability allows it to plunge directly into the workpiece, making it versatile for operations that require both side and end cutting. Right-hand cut and right-hand flute configuration is standard for conventional spindle rotation. It is appropriate for job shop, production, and maintenance machining environments where a reliable general-purpose end mill is needed.

Key Features

• 5/16-inch cutting diameter with a mill diameter tolerance of +0.003 / -0.000 inches for consistent fitment
• 4 spiral flutes with a 30-degree helix angle for efficient chip removal
• Centercutting design allows direct plunge entry into the workpiece
• Powdered metal construction provides uniform hardness and edge durability
• Right-hand cut and right-hand flute for standard spindle compatibility
• Uncoated finish suitable for regrinding and broad material compatibility

Compatibility

Designed as a general-purpose replacement or production end mill for use in standard 3/8-inch collets and end mill holders on vertical mills and CNC machining centers.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Ensure the machine spindle is fully powered down and locked out before changing tooling. Seat the 3/8-inch shank fully into a matched collet or end mill holder and tighten to the tool holder manufacturer's specifications. Verify runout with a dial indicator before production use to avoid premature tool wear or workpiece damage.