Robbjack SR-2-020 Square End Mill 1/64 in 2 Flute Carbide

Product Description

The ROBBJACK SR-2-020 is a solid carbide square end mill engineered for precision milling in tight-tolerance applications. Built on the SR-2 series platform, this tool features a 1/64 inch (0.0200 inch) cutting diameter and a 1/16 inch length of cut, making it well-suited for fine detail work, micro-slot milling, and small-feature contouring. The 30-degree spiral flute geometry promotes efficient chip evacuation, while the right-hand cut and right-hand flute configuration follows standard spindle rotation. Centercutting capability allows plunge entry. Licensed machinists and CNC operators working in tool rooms, job shops, and production environments are the primary users of this tool.

This end mill is designed for use in CNC machining centers and manual mills requiring micro-diameter tooling. The 1/8 inch straight cylindrical shank provides compatibility with standard ER collet systems and precision tool holders. Its regular-length geometry and 1-1/2 inch overall length suit close-clearance setups in dies, molds, and intricate part programs where larger tooling cannot reach. The uncoated carbide construction in the Tuffy material grade makes it appropriate for a range of ferrous and non-ferrous materials in light to moderate cutting conditions.

Key Features

• 1/64 inch (0.0200 inch) cutting diameter with a mill diameter tolerance of +0.0005/-0.0005 inches
• Solid carbide Tuffy material grade for hardness and wear resistance
• 30-degree helix angle with spiral flute geometry for efficient chip evacuation
• Centercutting design allows direct plunge entry without pre-drilling
• Right-hand cut, right-hand flute with 2-flute configuration
• Straight cylindrical 1/8 inch shank with tight tolerance of -0.0001/-0.0002 inches

Compatibility

Designed as an OEM-style micro end mill for use with standard 1/8 inch ER collets and precision tool holders on CNC machining centers and manual milling machines requiring small-diameter solid carbide tooling.

Installation Notes

Installation should be performed by a qualified machinist or CNC operator. Always power down and lock out the spindle before loading or removing tooling. Seat the shank fully and evenly in a precision collet or tool holder to the manufacturer-recommended engagement depth to minimize runout. Micro-diameter carbide end mills are brittle - avoid side-loading or impact during handling and setup.