Robbjack S1-401-04 Square End Mill 1/8 Inch 4 Flute Carbide

Product Description

The ROBBJACK S1-401-04 is a solid carbide square end mill designed for precision milling in metalworking and machining applications. With a 0.125-inch mill diameter, 4-flute geometry, and a 30-degree helix angle, this end mill delivers clean, accurate cuts in ferrous and non-ferrous materials. The stub-length configuration - 0.25 inches length of cut and 1.5 inches overall length - provides added rigidity during cutting operations, reducing deflection in tight tolerances. This tool is part of the ROBBJACK S1-401 series and is manufactured from C2-grade solid carbide in an uncoated finish.

The S1-401-04 is suited for use in CNC machining centers and manual milling machines handling small-diameter work. Its centercutting capability allows plunge cuts as well as conventional peripheral milling. The right-hand cut and right-hand spiral flute direction are standard for most vertical and horizontal milling setups. Typical applications include slotting, profiling, and pocketing in precision part manufacturing. This tool is intended for use by machinists and toolroom technicians working in job shops, production facilities, and maintenance environments.

Key Features

• Solid carbide construction, C2 material grade, for durability and heat resistance
• 4-flute, 30-degree right-hand spiral for smooth chip evacuation and surface finish
• Centercutting design enables direct plunge entry without pilot drilling
• Stub-length configuration increases rigidity and reduces deflection in tight-tolerance cuts
• Straight cylindrical shank for standard collet and end mill holder compatibility
• Uncoated finish suitable for use with cutting fluids on a range of workpiece materials

Compatibility

Designed as an OEM-style tooling option for use with standard 1/8-inch collets, end mill holders, and tool chucks on CNC machining centers and manual knee mills accepting straight cylindrical shanks.

Installation Notes

Installation should be performed by a qualified machinist following established tooling procedures. Ensure the spindle is fully stopped and the machine is locked out before mounting or removing tooling. Seat the shank fully in the collet or holder and torque the retention nut to the tool holder manufacturer's specification. Verify runout with a dial indicator before beginning a cut, particularly when working to close tolerances at this diameter.