Sumitomo U103722 Jobber Drill Bit 11/32 in Solid Carbide

Product Description

The SUMITOMO U103722 is a solid carbide jobber length drill bit designed for high-performance metal cutting in demanding trade and industrial applications. It measures 11/32 inches (0.3438 inches decimal) in diameter with a 135-degree split-point angle that reduces walking and improves entry accuracy. The bit features dual TiAlCr and TiSi coatings, which increase surface hardness and thermal resistance during high-speed drilling. Overall length is 5 inches with a straight-cylindrical shank. Coolant-through capability is built in, making this bit suitable for use with through-spindle coolant systems. It is sized to an h8 diameter tolerance for consistent, repeatable fit in precision drilling operations.

This drill bit is engineered for metal cutting applications, with primary workpiece material compatibility in cast iron, stainless steel, and carbon steel. It falls within the MDW-HGS series, which targets high-performance drilling at a 5xD flute-to-diameter ratio. Typical installation scenarios include CNC machining centers, manual drill presses, and production drilling setups where tool life and hole quality in ferrous and difficult-to-machine materials are critical. It is suited for machinists, toolroom technicians, and maintenance professionals working in manufacturing, fabrication, and heavy industrial environments.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard metal drilling
• Dual TiAlCr and TiSi coating combination for high thermal resistance and extended tool life
• 135-degree point angle reduces thrust force and improves self-centering on entry
• Coolant-through design supports through-spindle coolant delivery for chip evacuation and heat control
• Tapered web configuration reduces cutting resistance as the bit progresses through material
• h8 diameter tolerance provides consistent shank fit for precision toolholders

Compatibility

Designed for metal cutting in cast iron, stainless steel, and steel workpieces. Compatible with toolholders accepting a 0.3594-inch straight-cylindrical shank. Suitable for CNC and manual drilling equipment equipped with through-spindle coolant capability. Part of the SUMITOMO MDW-HGS series for materials coded K, M, P, and S per ISO workpiece material classification.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician familiar with carbide tooling and proper tool-holding procedures. Power down and lock out the spindle before inserting or removing the bit. Solid carbide is brittle compared to high-speed steel — avoid side loading, interrupted cuts beyond the tool design parameters, or dropping the bit on hard surfaces. Confirm coolant lines are clear and delivering adequate flow before initiating through-spindle coolant drilling cycles.