Cleveland C33611 Square End Mill 1/4 in 4 Flute Hss Tin

Product Description

The CLEVELAND C33611 is a 4-flute, single-end square end mill ground from high speed steel and finished with a titanium nitride (TiN) coating. It cuts with a left-hand rotation and left-hand spiral flute at a 30-degree helix angle, making it the correct tool for setups that require reverse-spindle cutting. The mill diameter is 0.25 inches, the length of cut is 0.625 inches, and the overall length is 2.4375 inches. The 0.375-inch straight-cylindrical shank also includes a Weldon flat for secure tool holding. This part belongs to the HG-4LL series and is installed by machinists and toolroom technicians working on milling machines and machining centers.

The C33611 is suited for milling cast iron, non-ferrous metals, and steel in regular-length reach applications. The left-hand cut configuration is typically selected when climb milling on reverse-spindle setups or when part fixturing requires a pulling rather than pushing cut force. It is not center-cutting, so it is not intended for direct plunge operations. Typical applications include slotting, profiling, and peripheral milling in job shop, production, and toolroom environments.

Key Features

• Left-hand cut and left-hand spiral flute for reverse-spindle milling operations
• TiN coating improves surface hardness and extends tool life on ferrous and non-ferrous workpieces
• 30-degree helix angle promotes smooth chip evacuation in spiral flute geometry
• High speed steel construction suitable for a range of workpiece materials including cast iron and steel
• Weldon flat on straight-cylindrical shank provides positive drive and prevents tool pullout
• Regular-length classification with 0.625-inch length of cut for standard depth work

Compatibility

Designed for use on milling machines and machining centers accepting a 0.375-inch straight-cylindrical or Weldon-flat shank. Primary workpiece materials listed by the manufacturer are cast iron, non-ferrous metal, and steel.

Installation Notes

Installation should be performed by a qualified machinist following the machine tool manufacturer's tool-holding torque and runout specifications. Verify spindle rotation direction before engaging the cut, as this is a left-hand cut tool and will not cut correctly in a standard right-hand spindle. Ensure the Weldon flat is aligned with the set screw in the tool holder and the collet or holder is fully seated before operation. Never exceed the machine's rated speed and feed for the tool diameter and workpiece material.