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

Product Description

The ROBBJACK SS-4-031 is a square-end, solid carbide end mill designed for high-precision milling in tight-tolerance applications. With a 0.031-inch (1/32 inch) mill diameter and a 0.0465-inch length of cut, this stub-length tool is built for small-feature work where rigidity and accuracy are critical. The 1/8-inch straight-cylindrical shank keeps the tool concentric in collet-style toolholders. Ground from ROBBJACK Tuffy-grade carbide, the SS-4-031 delivers consistent edge integrity in ferrous and non-ferrous materials. Licensed machinists and CNC setup technicians are the primary installers and operators of this tool.

This end mill belongs to the ROBBJACK SS-4 series, a stub-reach, four-flute line suited for precision profiling, slotting, and pocket milling on CNC machining centers and manual mills. The 30-degree spiral flute geometry promotes efficient chip evacuation, and the centercutting design allows plunge entry. The uncoated finish and Tuffy carbide grade make it a strong choice for non-ferrous metals, plastics, and softer alloys where coating buildup is a concern. It is not configured for extended-reach or deep-cavity work given its 1.5-inch overall length and stub-length classification.

Key Features

• 0.031-inch mill diameter with a tight tolerance of plus or minus 0.0005 inches for precision feature work
• Tuffy-grade solid carbide construction for edge strength and wear resistance
• 4-flute, 30-degree right-hand spiral flute for efficient chip flow and surface finish
• Centercutting design allows direct plunge milling without a pre-drilled entry hole
• 1/8-inch straight-cylindrical shank with a shank diameter tolerance of -0.0001 to -0.0002 inches for secure collet grip
• Stub-length (1.5-inch OAL) geometry maximizes rigidity and minimizes deflection on small-diameter cuts

Compatibility

Designed as an OEM-style replacement and standard tooling option for CNC machining centers and manual milling machines accepting a 1/8-inch straight-cylindrical shank end mill in an ER or similar collet system.

Installation Notes

Installation is performed by a qualified machinist or CNC operator. Ensure the spindle is fully stopped and the machine is in an e-stop or locked-out state before changing tooling. Insert the shank fully into a clean, undamaged collet to the recommended engagement depth and torque the collet nut to the toolholder manufacturer's specification. At this diameter, runout control is critical - inspect TIR with a test indicator before beginning a production cut.