Cleveland C39675 Square End Mill 5/16 in 3 Flute Hss Tin

Product Description

The CLEVELAND C39675 is a single-end square end mill designed for precision milling operations in metalworking and machining applications. Built from high speed steel (HSS) with a titanium nitride (TiN) finish, it offers improved surface hardness and wear resistance compared to uncoated HSS. The cutting diameter measures 0.3125 inches (5/16 inches) with a 0.75-inch length of cut, a 0.375-inch straight-cylindrical or Weldon flat shank, and a 2.5-inch overall length. Three spiral flutes with a 30-degree helix angle and centercutting capability allow plunge entry as well as side milling. This tool is installed by machinists and tool-and-die professionals on CNC mills, manual knee mills, and similar machining centers.

This end mill is suited for milling cast iron, non-ferrous metals, and steel in light to medium material removal operations. The regular-length profile fits standard tool holders without extended-reach setups. The right-hand cut and right-hand flute configuration matches conventional spindle rotation on most vertical and horizontal milling machines. The HG-3 series designation indicates a three-flute geometry intended for general-purpose work where chip clearance and surface finish balance are both priorities.

Key Features

• High speed steel construction with TiN coating for extended tool life on ferrous and non-ferrous materials
• Three spiral flutes at a 30-degree helix angle for balanced chip evacuation and finish quality
• Centercutting design allows direct plunge entry without pre-drilling
• Straight-cylindrical and Weldon flat shank for secure holder engagement
• Right-hand cut and right-hand flute for standard mill spindle compatibility
• Regular-length geometry fits most standard collet and end mill holders without modification

Compatibility

Designed as an OEM-style general-purpose end mill compatible with standard 3/8-inch collet chucks, end mill holders, and Weldon-style set-screw holders used on CNC and manual milling machines. Primary workpiece materials include cast iron, non-ferrous metals, and steel.

Installation Notes

Installation is performed by a qualified machinist. Power down and lock out the spindle before loading or changing tooling. Seat the shank fully into the collet or holder and torque the retention mechanism per the holder manufacturer specification. Verify runout with a dial indicator before beginning a cut, and confirm spindle rotation direction matches the right-hand cut orientation of this tool.