Robbjack T12-405-08 Square End Mill 1/4 in 4 Flute Carbide

Product Description

The ROBBJACK T12-405-08 is a solid carbide square end mill in the T12-405 series, designed for precision milling in demanding shop environments. With a 0.250-inch mill diameter, a 0.750-inch length of cut, and a 0.375-inch straight cylindrical shank, this tool delivers repeatable results in ferrous and non-ferrous materials. The four-flute, right-hand spiral configuration with a 30-degree helix angle promotes efficient chip evacuation and smooth cutting action. Centercutting geometry allows plunge entry as well as conventional side milling. This end mill is uncoated and suited for use with appropriate cutting fluids or in applications where coating is not required. Machinists, toolroom operators, and CNC programmers working in production or job-shop settings will find this a reliable general-purpose cutter.

The T12-405-08 is sized for light to medium material removal in applications requiring tight dimensional control. The regular-length body and 2.5-inch overall length make it compatible with standard milling setups on vertical machining centers, knee mills, and CNC routers. The Tuffy material grade designation from ROBBJACK indicates a carbide formulation selected for toughness in interrupted cuts and general milling. No extended reach, variable helix, chipbreaker, or variable index geometry is present, keeping this a straightforward tool for standard milling tasks.

Key Features

• 0.250-inch mill diameter with a mill diameter tolerance of +0.001 / -0.000 inches
• 4-flute, right-hand cut and right-hand flute spiral configuration
• 30-degree helix angle for efficient chip flow
• Centercutting design allows plunge milling without a pre-drilled entry hole
• Solid carbide construction in ROBBJACK Tuffy material grade
• Straight cylindrical shank with shank diameter tolerance of -0.0001 / -0.0002 inches

Compatibility

Designed as a standard square end mill replacement for applications requiring a 0.250-inch diameter, 0.375-inch shank, 4-flute solid carbide tool in the T12-405 series.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Ensure the machine spindle is fully stopped and locked out before mounting or removing the tool. Use a properly sized collet or end mill holder matched to the 0.375-inch shank diameter and torque the retention mechanism per the toolholder manufacturer's specifications. Confirm runout with a dial indicator after mounting to avoid premature tool wear or dimensional error.