Robbjack SS-4-040 Square End Mill 0.04 in 4 Flute Carbide

Product Description

The ROBBJACK SS-4-040 is a solid carbide square end mill designed for precision milling in tight geometries. It carries a 0.04 inch cutting diameter, a 0.0625 inch length of cut, and a 1/8 inch straight cylindrical shank, giving it a compact, stub-length profile suited for close-tolerance work. The four-flute spiral configuration with a 30-degree helix angle promotes efficient chip evacuation and smooth surface finish. This tool is uncoated and built from ROBBJACK Tuffy-grade solid carbide, which delivers the rigidity and edge retention needed in demanding machining environments. Machinists and tool-and-die professionals are the primary users of this end mill.

The SS-4-040 is well suited for slotting, profiling, and light plunge operations in ferrous and non-ferrous materials where a small-diameter tool is required. Its centercutting geometry allows direct plunge entry without a pre-drilled pilot hole. The stub length design minimizes deflection, making it a practical choice for finish passes, micro-milling operations, and work in confined part features on CNC machining centers and manual mills. The right-hand cut and right-hand flute orientation are standard for conventional CNC spindle setups.

Key Features

• 0.04 inch cutting diameter with a tolerance of plus 0.0005 inch / minus 0.0005 inch for consistent sizing
• Solid Tuffy-grade carbide construction for rigidity and edge retention
• Four spiral flutes with a 30-degree helix angle for efficient chip flow and smooth finish
• Centercutting design allows direct plunge entry
• Stub length (0.0625 inch LOC, 1.5 inch OAL) minimizes deflection in tight features
• Uncoated, right-hand cut, right-hand flute - standard orientation for CNC setups

Compatibility

Designed as a standard straight-shank end mill compatible with 1/8 inch collets and end mill holders on CNC machining centers and manual vertical mills running right-hand rotation spindles.

Installation Notes

Installation is performed by qualified machinists or toolroom personnel. Secure the 1/8 inch shank in a clean, undamaged collet or end mill holder and torque to the machine tool manufacturer's specification. Inspect the cutting edges for chips or damage before mounting. Verify spindle speed and feed rate against the material being cut before engaging the workpiece, and never exceed the tool's rated depth of cut for the given diameter.