Seco 17003140 Square End Mill 0.25in 3 Flute Carbide

Product Description

The SECO 17003140 is a solid carbide, single-end square end mill designed for high-precision milling operations in aluminum and non-ferrous materials. It features a 0.25 inch diameter cutting edge with a 0.375 inch length of cut and a 45-degree helix angle that promotes efficient chip evacuation in soft, gummy materials. The micrograin carbide substrate delivers edge sharpness and wear resistance well beyond standard grades. This tool ships uncoated (bright finish), which is appropriate for aluminum applications where certain coatings can cause material adhesion. Licensed machinists and CNC programmers in job shops, aerospace facilities, and general manufacturing typically specify this tool for finishing and light roughing passes.

This end mill fits standard short-length tooling applications where rigidity and minimal overhang are priorities. Its 0.25 inch straight shank accommodates common ER collet chucks, shrink-fit holders, and end mill adapters found on vertical machining centers and CNC routers. The right-hand cut, right-hand spiral flute configuration and centercutting capability allow plunge entry, slotting, profiling, and ramping operations. Primary workpiece materials are aluminum and non-ferrous metals, consistent with the Series A345 geometry and uncoated bright finish. The short overall length of 2.5 inches limits reach but maximizes tool stiffness.

Key Features

• Solid micrograin carbide construction for superior edge retention in aluminum and non-ferrous cuts
• 45-degree helix angle promotes aggressive chip evacuation and reduced cutting forces
• Centercutting design enables plunge milling, ramping, and full-slot entry
• Bright uncoated finish suited for aluminum where coating buildup is a concern
• Right-hand cut and right-hand flute direction for standard CNC spindle compatibility
• Tight tolerances: mill diameter -0.0000 to -0.0020 inches, shank diameter -0.0001 to -0.0004 inches, TIR maximum 0.0005 inches

Compatibility

Designed for use with standard 0.25 inch ER collet chucks, shrink-fit holders, and end mill adapters on vertical machining centers and CNC routers. Primary workpiece material compatibility is aluminum and non-ferrous metals (material code N) per SECO Series A345 geometry specifications.

Installation Notes

Installation and tool changes must be performed with the machine in an E-stop or fully powered-off state and spindle confirmed at rest. Seat the straight shank fully into the holder to the minimum clamping depth recommended by the toolholder manufacturer before torquing. Inspect the collet and bore for chips or wear before clamping, as contamination directly affects runout and can cause premature tool failure. Follow shop-specific speeds and feeds for the target material, and verify that coolant or air blast is directed at the cutting zone to clear chips, particularly in slotting operations.