Robbjack NR-303-03.5 Square End Mill 7/64 in 3 Flute

Product Description

The ROBBJACK NR-303-03.5 is a solid carbide square end mill designed for precision milling in metalworking and machining applications. With a 7/64 inch (0.1094 inch) cutting diameter and three spiral flutes, it delivers efficient chip evacuation and a clean square shoulder. The 7/16 inch length of cut and 1/8 inch straight cylindrical shank make it well-suited for tight-clearance work where a compact, rigid tool is required. Centercutting geometry allows for direct plunge entry. This is a right-hand cut, right-hand flute tool from the NR-303 series, offered uncoated in C2 carbide grade with a 30-degree helix angle and standard regular-length profile.

This end mill is intended for use in CNC machining centers, manual mills, and precision drilling and milling setups where small-diameter tooling is required. Its compact overall length of 1-1/2 inches and 1/8 inch shank suit it to die work, mold work, and fine-detail profiling in ferrous and non-ferrous materials. Machinists and toolroom operators working with tight tolerances and small-footprint features will find this a practical tool for slotting, profiling, and plunge cutting operations.

Key Features

• Solid carbide construction in C2 material grade for rigidity and wear resistance in precision cuts
• Three spiral flutes with 30-degree helix angle for improved chip flow and surface finish
• Centercutting design enables direct plunge entry without pre-drilling
• Right-hand cut and right-hand flute orientation - standard for conventional CNC setups
• Straight cylindrical 1/8 inch shank fits standard collets and end mill holders
• Mill diameter tolerance of plus 0.001 / minus 0.000 inches for consistent, repeatable sizing

Compatibility

Designed as an OEM-style replacement or direct-fit tool for machining setups requiring a 1/8 inch shank, small-diameter square end mill in the ROBBJACK NR-303 series.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Ensure the spindle is fully stopped and the machine is powered down before changing tooling. Secure the shank fully within the collet or end mill holder to the recommended engagement depth to prevent pullout under cutting load. Verify runout with a dial indicator before production use, especially given the small diameter and tight tolerances of this tool.