Seco 17011878 Square End Mill 1-1/4 in 6 Flutes Cobalt

Product Description

The SECO 17011878 is a single-end, 6-flute cobalt square end mill built for demanding metal removal in production and job-shop environments. The cutter measures 1.25 inches in diameter with a 4-inch length of cut, a 1.25-inch shank diameter, and a 6.5-inch overall length. Manufactured from M42 cobalt high-speed steel with a bright uncoated finish, it delivers good heat resistance and edge toughness without the added cost of a PVD coating. The 30-degree right-hand spiral flute geometry promotes smooth chip evacuation and stable cutting action across a range of workpiece materials. This tool is installed by machinists and CNC operators on vertical and horizontal milling machines.

The 17011878 is rated for use on steel, stainless steel, cast iron, aluminum and non-ferrous materials, and high-temperature alloys, corresponding to ISO material groups P, M, K, N, and S. The centercutting design allows the tool to plunge directly into the workpiece, giving operators flexibility for slot milling, peripheral milling, and ramping operations. The right-hand flute and right-hand cut configuration suits standard spindle rotation on most milling centers. The Series SPC408 designation places this tool within a family of general-purpose cobalt end mills intended for shops that require reliable performance across mixed-material work without switching to carbide tooling.

Key Features

• M42 cobalt HSS construction for elevated heat and wear resistance compared to standard M2 HSS
• 6-flute geometry increases feed rate capability and improves surface finish on finishing passes
• 30-degree helix angle balances chip evacuation with radial cutting forces on ferrous materials
• Centercutting design supports plunge entry without a pre-drilled pilot hole
• Bright uncoated finish maintains consistent dimensions and suits re-sharpening without coating concerns
• Single-end construction with 1.25-inch straight shank for direct ER or Weldon-style holder mounting

Compatibility

Designed as a direct-fit replacement or specification purchase for milling operations requiring a 1.25-inch diameter, 6-flute cobalt square end mill in the SECO SPC408 series. Compatible with standard 1.25-inch collet chucks, ER collet holders, and Weldon-style end mill holders on vertical and horizontal milling centers.

Installation Notes

Installation is performed by a qualified machinist or CNC setup technician. Secure the shank fully within the holder to the recommended gauge-line depth and torque set screws per holder manufacturer specifications before spindle engagement. Verify runout against the published TIR maximum of 0.001 inches using a dial indicator before initiating the cut. Always power down and lock out the spindle before changing tooling, and confirm workpiece clamping is secure prior to operation.