Osg 404-3906 Square End Mill 25/64 in 4 Flute Carbide

Product Description

The OSG 404-3906 is a solid carbide square end mill designed for precision milling in a wide range of ferrous and non-ferrous materials. It features a 25/64 inch (0.3906 inch) cutting diameter with a 1 inch length of cut, a 7/16 inch shank diameter, and a 2-3/4 inch overall length. The four-flute, spiral design with a 30-degree helix angle promotes efficient chip evacuation and stable cutting performance. Manufactured from micrograin carbide, this end mill delivers consistent edge sharpness and wear resistance in demanding milling applications. It is uncoated and suitable for use in manual or CNC milling setups where tight tolerances are required.

The OSG 404-3906 is suited for general-purpose slot milling, peripheral milling, and profiling operations in machine shops and manufacturing environments. Its centercutting capability allows plunge entry, expanding its versatility in die and mold work, fixture fabrication, and prototype machining. Right-hand cut and right-hand flute configuration are standard for conventional CNC mill spindle setups. This is a regular-length end mill in the OSG Series 404 lineup, appropriate for applications where extended reach is not required.

Key Features

• Micrograin solid carbide construction for consistent edge retention and dimensional accuracy
• 25/64 inch cutting diameter with 1 inch length of cut for moderate depth slot and profile work
• Four-flute spiral design with 30-degree helix angle for efficient chip flow
• Centercutting geometry allows direct plunge entry without pre-drilling
• Right-hand cut and right-hand flute configuration for standard CNC spindle compatibility
• Uncoated finish suitable for dry cutting or use with cutting fluid

Compatibility

Designed as an OEM-style replacement and standard tooling option for CNC and manual milling machines accepting a 7/16 inch straight shank end mill holder or collet.

Installation Notes

Installation should be performed by a qualified machinist or CNC operator. Ensure the milling machine spindle is fully powered down and locked out before inserting or removing the end mill from the holder or collet. Use a properly sized collet or end mill holder matched to the 7/16 inch shank diameter to prevent runout and tool pullout during operation. Follow applicable shop safety procedures and machine manufacturer guidelines for tooling installation and torque specifications.