Cleveland C39621 Square End Mill 0.25in 3 Flute Hss Ticn

Product Description

The CLEVELAND C39621 is a double-end square end mill designed for precision milling in metalworking and machining applications. Built from high speed steel with a titanium carbonitride (TiCN) finish, it delivers improved surface hardness and wear resistance compared to uncoated HSS tooling. The cutting diameter measures 0.25 inches with a 0.625-inch length of cut, a 0.375-inch straight-cylindrical shank with Weldon flat, and a 3.375-inch overall length. Three right-hand spiral flutes at a 30-degree helix angle promote efficient chip evacuation and smooth cutting action. This end mill is centercutting, allowing direct plunge entry into the workpiece.

The C39621 is rated for use on cast iron, non-ferrous metals, and steel, making it a versatile choice for general-purpose milling in job shops, tool rooms, and production environments. Its HD-3 series designation indicates a heavy-duty geometry suited for slotting, profiling, and peripheral milling operations on ferrous and non-ferrous workpieces. The double-end configuration extends usable tool life by providing two cutting ends per shank.

Key Features

• High speed steel construction with TiCN coating for increased hardness and wear resistance
• Double-end design provides two usable cutting ends per tool
• Centercutting geometry allows direct plunge milling without pre-drilling
• Three-flute, right-hand spiral configuration at 30-degree helix for efficient chip clearing
• Straight-cylindrical shank with Weldon flat for secure tool holding
• HD-3 series heavy-duty geometry suited for cast iron, non-ferrous metals, and steel

Compatibility

Designed as an OEM-style replacement and standard tooling option compatible with milling machines and machining centers accepting a 0.375-inch straight-cylindrical or Weldon flat shank. Rated for primary workpiece materials including cast iron, non-ferrous metals, and steel.

Installation Notes

Installation should be performed by a qualified machinist or CNC operator. Secure the shank fully into the tool holder, ensuring the Weldon flat is engaged with the set screw to prevent pullout under load. Verify spindle speed and feed rate are appropriate for the workpiece material and cutting diameter before engaging the cut. Inspect the tool for chips or wear on both ends before use.