Mitsubishi 691059 Square End Mill 6mm 4 Flute Carbide Alcrn

Product Description

The MITSUBISHI 691059 is a solid carbide square end mill engineered for demanding metal removal in steel, stainless steel, aluminum, and high-temperature alloy applications. Measuring 6 mm in diameter with a 24 mm length of cut and a 60 mm overall length, this single-end tool features four flutes with a variable helix and variable index geometry. The variable helix angle, ranging from 38 to 40 degrees, disrupts harmonic chatter during cutting, improving surface finish and tool stability. An AlCrN coating provides high-temperature oxidation resistance and hardness, extending tool life in abrasive and heat-generating cuts. This tool is part of the MITSUBISHI VQ Endmill VHQJHV series and is sized in the metric system.

This end mill is suited for finish and semi-finish milling operations on steel and stainless steel workpieces classified under ISO material codes P and M, as well as aluminum and non-ferrous materials (code N) and high-temperature alloys (code S). It is a right-hand cut, right-hand flute tool with a straight shank and falls into the medium length category. Typical applications include slot milling, peripheral milling, and contour milling on CNC machining centers in job shop and production environments. The 6 mm shank diameter matches the 6 mm cutter diameter, making it straightforward to chuck in standard collet systems.

Key Features

• Variable helix and variable index geometry reduces chatter and improves surface finish
• AlCrN coating delivers high oxidation resistance and extended tool life in ferrous and high-temp alloy cuts
• Solid carbide construction provides rigidity and wear resistance over high-speed tool steel alternatives
• Four-flute design balances chip evacuation and cutting edge count for productivity in steel and stainless
• Right-hand cut and right-hand flute orientation suitable for standard CNC spindle configurations
• Medium length classification with 24 mm neck length allows reach without sacrificing rigidity

Compatibility

Designed for use in CNC machining centers and manual mills accepting a 6 mm straight shank collet. Primary workpiece materials include steel, stainless steel, aluminum and non-ferrous metals, and high-temperature alloys. Not center-cutting; not suitable for direct plunge operations.

Installation Notes

This end mill is installed by a machinist or tooling technician into a compatible collet or end mill holder sized for a 6 mm shank, with shank diameter tolerance of h6. Confirm the spindle is fully stopped and the machine is in a locked or e-stopped state before changing tooling. Verify runout with a dial indicator after seating the tool to ensure concentricity within acceptable limits for the operation. Because this tool is not center-cutting, ramping or helical interpolation entry strategies are required when plunging into a closed pocket.