Robbjack SR-4-050 Square End Mill 3/64 in 4 Flute Carbide

Product Description

The ROBBJACK SR-4-050 is a 4-flute solid carbide square end mill from the SR-4 Series, designed for precision milling in tight-tolerance applications. With a mill diameter of 0.0500 inches (3/64 inch) and a shank diameter of 0.1250 inches (1/8 inch), this tool is built for small-feature work requiring exact dimensional control. The 0.15-inch length of cut and 1.5-inch overall length make it well-suited for shallow pocket milling and profiling where rigidity and concentricity are critical. It features right-hand cut, right-hand spiral flute geometry at a 30-degree helix angle, and centercutting capability. This tool is intended for use by machinists and CNC operators in job shops, tool rooms, and production environments.

The SR-4-050 is suited for milling small features in a range of materials, as identified by the Tuffy material grade designation used in ROBBJACK's SR-4 Series lineup. The uncoated solid carbide construction makes it appropriate for applications where coating buildup on fine features would compromise dimensional accuracy. Typical install scenarios include CNC machining centers and high-speed spindle setups where small-diameter tooling is run at elevated RPM with light radial engagement. This tool is a standard straight-shank, straight-cylindrical design for direct collet or end mill holder mounting.

Key Features

• 0.0500-inch (3/64 inch) mill diameter with tight tolerance of plus 0.0005 / minus 0.0005 inches
• 4-flute spiral geometry with 30-degree helix angle for smooth chip evacuation
• Centercutting design allows plunge entry into workpiece material
• Solid carbide construction in ROBBJACK Tuffy material grade for rigidity at small diameters
• Right-hand cut and right-hand flute direction for standard CNC spindle compatibility
• Straight-cylindrical shank for secure collet or end mill holder retention

Compatibility

Designed as a direct-fit replacement or standard tooling selection within the ROBBJACK SR-4 Series for CNC machining centers and manual mills equipped with 1/8-inch collets or end mill holders.

Installation Notes

Installation should be performed by a qualified machinist or CNC operator. Verify collet size matches the 0.1250-inch shank diameter before mounting, and confirm appropriate tool stick-out for the application to maintain rigidity. At this diameter, tool breakage risk increases with excessive feed rates or radial depth of cut - always follow manufacturer feed and speed recommendations for the specific workpiece material. Inspect the cutting edges under magnification before use to confirm the tool is free of chips or damage.