Robbjack SR-4-047 Square End Mill 3/64 in 4 Flute Carbide

Product Description

The ROBBJACK SR-4-047 is a 4-flute, solid carbide square end mill from the SR-4 Series, designed for precise milling in tight-tolerance applications. It features a 3/64 inch (0.0470 inch) mill diameter with a 9/64 inch (0.1410 inch) length of cut and a 1/8 inch straight-cylindrical shank. Built from ROBBJACK Tuffy-grade solid carbide, this end mill delivers the rigidity and wear resistance needed for small-diameter work in ferrous and non-ferrous materials. Centercutting geometry allows plunge milling as well as peripheral and slot cuts. Installed by machinists and tool-and-die professionals, it suits CNC machining centers and manual mills running high-speed finishing or detail work.

The SR-4-047 fits residential and commercial machining applications where fine-feature milling is required. Its 1-1/2 inch overall length and regular-length classification make it appropriate for standard-reach slotting, profiling, and pocket milling on small components and precision parts. The uncoated finish is suited for applications where re-sharpening is anticipated or where coating interaction with the workpiece material is a concern. Right-hand cut and right-hand spiral flute orientation align with conventional CNC and manual mill setups.

Key Features

• 3/64 inch mill diameter (0.0470 inch) with tight tolerance of +0.0005/-0.0005 inch for precise fitment
• 4-flute spiral geometry with 30-degree helix angle for smooth chip evacuation and surface finish
• Centercutting design enables both plunge and peripheral milling operations
• Tuffy-grade solid carbide construction for hardness and thermal resistance in small-diameter cuts
• Right-hand cut, right-hand flute for standard machine compatibility
• Uncoated finish suitable for re-sharpening and compatible with a broad range of workpiece materials

Compatibility

Designed as an OEM-style solid carbide square end mill in the ROBBJACK SR-4 Series, compatible with standard 1/8 inch collets and straight-cylindrical shank toolholders on CNC machining centers and manual milling machines.

Installation Notes

Installation and tool changes should be performed by a qualified machinist with the spindle fully stopped and the machine in a safe, de-energized state. Ensure the collet or toolholder bore matches the 1/8 inch shank diameter before tightening. Do not exceed the recommended depth of cut for small-diameter carbide end mills, as solid carbide is brittle and susceptible to breakage under lateral shock loads. Follow all applicable machine-specific tooling and runout specifications during setup.