Description

The SECO 17016369 is a cobalt square end mill designed for high-performance milling in ferrous and heat-resistant materials. Built from M42 cobalt high-speed steel and coated with titanium carbonitride (TiCN), it delivers extended tool life in applications where standard HSS tools wear prematurely. The cutter measures 9/32 inch (0.2812 inch) in diameter with a 9/16 inch length of cut, a 3/8 inch shank, and a 2-5/16 inch overall length. The two-flute, right-hand spiral geometry with a 30-degree helix angle promotes chip evacuation and reduces cutting forces. It is center-cutting, allowing plunge entry without a pre-drilled pilot hole. This tool belongs to the SP205 series short-length end mill line.

This end mill is suited for slotting, profiling, and plunge milling in steel, stainless steel, cast iron, and high-temperature alloys. Its short-length classification provides rigidity in tight-tolerance applications and shallow-to-moderate depth-of-cut work. The TiCN coating improves surface hardness and reduces friction against abrasive workpiece materials. Machine shops, tool-and-die operations, and maintenance machinists running manual or CNC milling equipment will find this cutter appropriate for general steel machining and difficult-to-machine alloy work where M42 cobalt outperforms standard M2 HSS.

Key Features

M42 cobalt high-speed steel construction for improved hot hardness and wear resistance over standard HSS
TiCN coating increases surface hardness and reduces built-up edge on ferrous and high-temp alloy materials
Center-cutting design permits direct plunge entry without pre-drilling
30-degree right-hand spiral flutes promote chip evacuation and reduce cutting pressure
Short-length (SP205 series) geometry provides added rigidity for close-tolerance milling
Mill diameter tolerance of +0.0000 to -0.0030 inch ensures consistent fit in standard toolholders

Compatibility

Designed as a standard fractional-inch shank end mill compatible with 3/8 inch collets, end mill holders, and milling chucks on CNC machining centers and manual knee mills. Primary workpiece material codes P, M, K, and S cover steel, stainless steel, cast iron, and high-temperature alloys respectively.

Installation Notes

Installation and tool changes must be performed with the spindle fully stopped and the machine locked out per applicable shop safety procedures. Seat the 3/8 inch shank fully into the toolholder and torque the retention mechanism to the holder manufacturer’s specification. Verify runout against the stated TIR maximum of 0.0010 inch before beginning a cut. Do not exceed the rated length of cut when programming depth-of-cut passes.

Technical Specifications

Mill Diameter: 9/32 inch (0.2812 inch)
Length of Cut: 9/16 inch (0.5625 inch)
Shank Diameter: 3/8 inch (0.3750 inch)
Overall Length: 2-5/16 inch (2.3125 inch)
Number of Flutes: 2
End Mill Material: Cobalt (M42 HSS)
Coating/Finish: TiCN
Helix Angle: 30 degrees
Flute Type: Spiral
Cutting Direction: Right Hand
Flute Direction: Right Hand
Single or Double End: Single
Center Cutting: Yes
Length Type: Short
Series: SP205
Mill Diameter Tolerance: +0.0000 to -0.0030 inch
Shank Diameter Tolerance: -0.0001 / -0.0005 inch
Overall Length Tolerance: +0.0620 / 0.0000 inch
TIR Maximum: 0.0010 inch
Primary Workpiece Materials: Steel, Stainless Steel, Cast Iron, High-Temp Alloy
System of Measurement: Fractional Inch
Weight: 0.3 pounds