Seco 17011666 Square End Mill 1-1/4 in 2 Flute Cobalt

Product Description

The SECO 17011666 is a single-end square end mill designed for material removal in demanding machining applications. Built from M42 cobalt high-speed steel and left in a bright, uncoated finish, this tool offers solid heat resistance and edge retention without a coating. It runs a 1.25-inch cutting diameter, a 1.625-inch length of cut, and a 30-degree right-hand spiral flute geometry that promotes efficient chip evacuation. Centercutting capability allows plunge entry directly into the workpiece. This tool is intended for use by machinists and tool-and-die professionals working in production or job-shop environments.

The 17011666 is engineered for cutting steel, stainless steel, cast iron, and high-temperature alloys, covering ISO material codes P, M, K, and S. The 1.25-inch straight shank fits standard milling chucks and collet holders at that bore diameter. The 4.125-inch overall length suits most vertical milling machine and machining center setups where extension reach is not required. It is part of the SP205 series, which targets general-purpose and mid-difficulty alloy machining at conventional cutting parameters.

Key Features

• M42 cobalt construction for elevated heat resistance and hardness retention in tough alloys
• Bright, uncoated finish suitable for applications where coating adhesion or re-coating is a factor
• 30-degree right-hand spiral flute geometry supports smooth chip flow and reduced cutting force
• Centercutting design permits direct plunge milling without a pre-drilled entry point
• 2-flute configuration provides wider chip clearance, well-suited for slotting and pocketing
• Single-end tool — full cutting geometry at one end, 1.25-inch shank on the other

Compatibility

Designed for use with steel, stainless steel, cast iron, and high-temperature alloys (ISO codes P, M, K, S). Fits standard 1.25-inch bore milling chucks, end mill holders, and collet systems. Part of the SECO SP205 series.

Installation Notes

Installation should be performed by a qualified machinist familiar with tool runout tolerances and proper tool retention torque for the holder type in use. Ensure the spindle and machine are fully powered down and locked out before changing tooling. Verify that shank engagement depth meets the holder manufacturer minimum before operation. Do not exceed the tool manufacturer recommended speeds and feeds for the workpiece material and depth of cut being applied.