Robbjack T12-405-04.5 Square End Mill 9/64 in 4 Flute

Product Description

The ROBBJACK T12-405-04.5 is a solid carbide square end mill designed for precision milling operations in metalworking and machining applications. This single-end, centercutting tool features a 9/64-inch (0.1406-inch) mill diameter, a 4-flute spiral configuration, and a 30-degree helix angle. The right-hand cut and right-hand flute geometry provide efficient chip evacuation and stable cutting performance. Built to the T12-405 series standard under RobbJack's Tuffy material grade, this end mill is suited for general-purpose milling in tough materials where carbide rigidity and sharp geometry are required. Licensed machinists and CNC operators are the primary installers and users of this tooling.

This end mill is appropriate for use in vertical and horizontal milling machines, CNC machining centers, and manual mills. It is configured for slot milling, profiling, and plunge cutting due to its centercutting design. The uncoated carbide construction makes it a straightforward fit for shops running ferrous and non-ferrous materials where coating is not a process requirement. The regular length classification keeps it suitable for standard-depth pockets and contours without extended reach concerns.

Key Features

• Solid carbide construction - Tuffy material grade for rigidity and wear resistance
• 4-flute spiral geometry with 30-degree helix angle for efficient chip flow
• Centercutting design allows direct plunge entry into workpiece
• Right-hand cut and right-hand flute - standard CNC and manual mill orientation
• Uncoated finish - no coating compatibility concerns for specific material or coolant combinations
• Mill diameter tolerance of +0.001/-0.000 inches for precise fit in tight-tolerance applications

Compatibility

Designed as an OEM-style tooling option for standard straight-cylindrical shank tool holders accepting a 3/8-inch shank diameter, compatible with ER collets, end mill holders, and similar workholding systems used in CNC and manual milling setups.

Installation Notes

Installation should be performed by a qualified machinist following the tool holder manufacturer's torque and runout specifications. Ensure the machine spindle is fully stopped and the machine is in a safe, de-energized state before inserting or removing the tool. Verify collet or holder bore size matches the 3/8-inch shank before securing. Confirm proper tool projection length and runout with a dial indicator before initiating any cut cycle.