Mitsubishi 10556542 Extra Length Drill Bit 0.3425in Carbide

Product Description

The MITSUBISHI 10556542 is a carbide extra length drill bit designed for demanding deep hole drilling applications. Built to MVS series standards, it features a TiAlN coating for extended tool life and heat resistance at high cutting speeds. The drill point is ground to 140 degrees with X-Thinning geometry, reducing entry thrust and improving chip evacuation. With an overall length of 12.2677 inches and a flute length of 9.9843 inches, this bit reaches depths up to 8.626 inches. The helical, right-hand flute and parallel web configuration make it well suited for precision work in tight-tolerance bores. Installed by machinists and CNC operators in production and job shop environments.

This drill bit is rated for a broad range of workpiece materials with steel as the primary application material. Secondary materials include stainless steel, superalloys, titanium, structural steel, tempered steel, iron, high strength bronze, hardened steel, copper, cast iron, carbon steel, bronze, brass, aluminum, and aluminum alloy. Typical use cases include deep hole drilling, cross hole drilling, stack drilling, and standard through-hole operations across aerospace, automotive, and general metalworking applications. The 25xD flute-to-diameter ratio supports extended reach without sacrificing rigidity in the shank zone.

Key Features

• TiAlN coating improves heat resistance and extends tool life in ferrous and non-ferrous materials
• 140-degree X-Thinned drill point reduces entry thrust and centers the bit accurately
• Coolant-through design delivers cutting fluid directly to the tip for deep hole chip clearance
• 25xD flute-to-diameter ratio enables drilling depths up to 8.626 inches
• Cylindrical shank at 0.3937 inches diameter fits standard collet and drill chuck toolholding
• Right-hand helical flute with parallel web for consistent chip evacuation and bore finish

Compatibility

Designed as an OEM-style replacement and production cutting tool for CNC machining centers, drill presses, and deep hole drilling setups requiring a 0.3425-inch diameter carbide drill with a cylindrical shank and coolant-through capability.

Installation Notes

Installation is performed by a machinist or CNC setup technician. The machine spindle must be fully stopped and the tool changer or spindle lock engaged before loading or changing the bit. Verify collet or chuck bore matches the 0.3937-inch shank diameter before clamping. Confirm coolant-through passages are clear and coolant supply pressure is set to the machine specification before initiating a cut.