Cleveland C39733 Square End Mill 0.25 in 3 Flute Hss

Product Description

The CLEVELAND C39733 is a single-end, square-profile end mill ground from high speed steel (HSS) and designed for general-purpose milling in machine shop and production environments. The cutter measures 0.25 inches in diameter with a 1.25 inch length of cut, a 0.375 inch straight-cylindrical shank with Weldon flat, and a 3.0625 inch overall length. Three right-hand spiral flutes with a 30-degree helix angle provide efficient chip evacuation and smooth cutting action. The centercutting geometry allows direct plunge entry into the workpiece without a pre-drilled hole. This tool belongs to Cleveland's HG-3 long series, intended for reach-demanding applications. It is uncoated and ready for use with standard cutting fluids.

The C39733 is suited for milling cast iron, non-ferrous metals, and steel in both manual and CNC machining setups. The long-series configuration gives machinists additional reach for slotting, profiling, and peripheral milling in deeper pockets or stepped features where a standard-length end mill would fall short. Right-hand cut and right-hand flute orientation match the conventional spindle rotation of most vertical and horizontal mills. The straight shank with Weldon flat seats securely in side-lock and collet holders commonly found in production toolrooms.

Key Features

• 0.25 inch cutting diameter with 1.25 inch length of cut for deep slot and pocket work
• 3 right-hand spiral flutes at 30-degree helix for efficient chip flow on ferrous and non-ferrous materials
• Centercutting design permits direct plunge milling without pilot drilling
• High speed steel construction offers toughness and regrindability
• 0.375 inch straight-cylindrical shank with Weldon flat for positive grip in side-lock holders
• Long-series HG-3 classification provides additional reach versus standard-length end mills
• Uncoated finish — compatible with most water-soluble and oil-based cutting fluids

Compatibility

Designed for use in standard side-lock, Weldon-flat, and collet-style tool holders accepting a 0.375 inch shank. Primary workpiece materials are cast iron, non-ferrous metals, and steel as indicated by material codes K, N, and P.

Installation Notes

Installation should be performed by a qualified machinist with the spindle fully powered down and locked out before mounting or removing the tool. Seat the Weldon flat squarely against the set screw in the tool holder and torque according to the holder manufacturer's specification to prevent pullout under cutting loads. Confirm runout with a dial indicator before taking the first cut, particularly given the long-series overhang. Always verify spindle speed and feed rate against published HSS cutting data for the specific workpiece material before engaging the cutter.