Sumitomo U103735 Taper Length Drill Bit 27/64 in Carbide

Product Description

The SUMITOMO U103735 is a taper length drill bit engineered for high-performance drilling in demanding industrial and metalworking applications. Built from solid carbide with a DEX coating, it delivers extended tool life and consistent cutting performance in hard and abrasive materials. The bit measures 27/64 inch (0.4219 inch decimal) in diameter with a 135-degree split point for accurate self-centering entry and reduced thrust. A J-Flute geometry and coolant-through design support chip evacuation and thermal management during deep-hole operations. This bit is part of the MDW-HGS series and is installed by machinists and tool-and-die professionals on CNC machining centers and drill presses.

This drill bit is suited for taper-length drilling operations in ferrous metals, alloys, and other materials where carbide grades outperform high-speed steel. The 8xD flute-to-diameter ratio makes it appropriate for moderately deep holes without the need for peck cycles on many materials. The straight cylindrical shank fits standard collets and drill chucks. Its coolant-through capability makes it a strong match for CNC setups where through-spindle coolant is available, reducing heat buildup and extending edge life in production environments.

Key Features

• Solid carbide construction with DEX coating for extended wear resistance
• 135-degree point angle for self-centering entry and reduced walking
• J-Flute geometry promotes efficient chip evacuation
• Coolant-through design compatible with through-spindle coolant systems
• 8xD flute-to-diameter ratio supports moderately deep-hole applications
• Straight cylindrical shank fits standard collets and drill chucks
• Tapered web configuration for added rigidity at the cutting edge

Compatibility

Designed as an OEM-specification taper length drill bit in the MDW-HGS series, compatible with CNC machining centers and drill presses equipped with straight-shank toolholders or collets sized for a 0.4375-inch shank diameter.

Installation Notes

Installation and setup should be performed by a qualified machinist or tooling technician. Ensure the spindle is fully stopped and locked out before loading or removing the bit from the toolholder. Confirm collet or chuck bore matches the 0.4375-inch shank diameter to prevent runout. When using coolant-through capability, verify that coolant pressure and flow rate are within the machine tool manufacturer's recommended range before starting the cut.