Cleveland C39686 Square End Mill 3/4 in 3 Flute Hss Tin

Product Description

The CLEVELAND C39686 is a 3-flute, single-end square end mill designed for general-purpose milling in machine shop and production environments. Built from high speed steel (HSS) with a titanium nitride (TiN) finish, it offers improved wear resistance and tool life compared to uncoated HSS tooling. The cutter measures 0.750 inches in diameter with a 1.625-inch length of cut and a 3.875-inch overall length. The 30-degree spiral flute geometry promotes efficient chip evacuation, and the centercutting design allows for plunge entry into the workpiece. This end mill is installed and operated by machinists and CNC or manual mill operators across job shop and production settings.

The C39686 is suited for milling operations on cast iron, non-ferrous metals, and steel. Its right-hand cut and right-hand flute configuration is standard for conventional and climb milling setups. The straight cylindrical shank with Weldon flat accommodates standard end mill holders and set-screw tool holders. It carries a regular length classification and falls within a length-of-cut range of 1.500 to 2.000 inches, making it appropriate for moderate-depth slotting, profiling, and peripheral milling applications.

Key Features

• 3-flute high speed steel construction with TiN coating for extended wear resistance
• Centercutting geometry allows direct plunge milling without a pre-drilled pilot hole
• 30-degree helix angle promotes smooth cutting action and effective chip removal
• Right-hand cut and right-hand spiral flute — standard orientation for most milling setups
• Straight shank with Weldon flat for secure clamping in set-screw tool holders
• HG-3 series design suitable for cast iron, non-ferrous metals, and steel workpieces

Compatibility

Compatible with workpiece materials including cast iron, non-ferrous metals, and steel. Fits standard 3/4-inch end mill holders and Weldon-style tool holders. Designated as HG-3 series.

Installation Notes

Installation and toolpath setup should be performed by a qualified machinist or CNC operator. Ensure the spindle is fully stopped and the machine is powered down or in a safe state before loading or removing the end mill. Secure the Weldon flat against the set screw in the tool holder to prevent axial pullout under cutting loads. Verify runout with a dial indicator after clamping before beginning a cutting operation.