Robbjack SR-4-031 Square End Mill 1/32 in 4 Flute Carbide

Product Description

The ROBBJACK SR-4-031 is a solid carbide square end mill from the SR-4 series, designed for precision milling in demanding cutting applications. It features a 1/32-inch (0.031-inch) mill diameter with a 0.093-inch length of cut and a 1/8-inch straight cylindrical shank, making it well suited for fine detail work in tight cavities. The 4-flute, right-hand spiral geometry with a 30-degree helix angle promotes efficient chip evacuation while delivering a smooth finish. Centercutting capability allows direct plunge entry. Machinists and CNC operators working with ferrous and non-ferrous materials will find this tool reliable for small-feature milling where dimensional accuracy is critical.

This end mill is intended for use in CNC machining centers and manual mills requiring small-diameter tooling. Its regular-length profile and 1-1/2-inch overall length suit benchtop and production setups where reach is limited and rigidity is a priority. The uncoated solid carbide construction in the Tuffy material grade provides good wear resistance for general-purpose milling across a range of workpiece materials. It is appropriate for use in tool and die, mold making, electronics, and precision part manufacturing environments.

Key Features

• 1/32-inch mill diameter with plus or minus 0.0005-inch diameter tolerance for tight dimensional control
• 4-flute right-hand spiral with 30-degree helix angle for efficient chip flow and surface finish
• Centercutting design allows direct plunge milling without a pre-drilled entry hole
• Solid carbide Tuffy-grade construction delivers hardness and wear resistance in demanding cuts
• Straight cylindrical 1/8-inch shank fits standard collets with a shank tolerance of -0.0001 to -0.0002 inches
• Uncoated finish suitable for general-purpose applications across ferrous and non-ferrous materials

Compatibility

Designed as an OEM-style replacement or direct-fit tooling option for CNC machining centers and manual mills accepting a 1/8-inch straight cylindrical shank collet.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Ensure the machine spindle is fully stopped and all motion axes are locked before changing tooling. Seat the shank fully and evenly in a matched collet to the specified shank diameter to avoid runout. Verify tool projection and clearance against the workpiece fixture before initiating a cutting program.