Sumitomo U103686 Jobber Drill Bit 3/16 in Solid Carbide

Product Description

The SUMITOMO U103686 is a jobber-length drill bit designed for high-performance metal cutting in demanding industrial and trade applications. It measures 3/16 inches (0.1875 inches) in diameter with an overall length of 3.8583 inches and a flute length of 1.7323 inches. Constructed from solid carbide and coated with a TiAlCr and TiSi dual-layer finish, it delivers enhanced hardness and heat resistance at the cutting zone. The 135-degree split-point tip reduces walking on entry and minimizes the need for a center punch. A 5xD flute-to-diameter ratio supports chip evacuation in deeper holes. This bit is installed by machinists, tool-and-die tradespeople, and maintenance technicians working with high-strength metals.

The U103686 is rated for use in cast iron, stainless steel, and carbon steel workpieces, corresponding to material codes K, M, P, and S. The straight-cylindrical shank with a diameter of 0.1875 inches fits standard drill chucks and collet holders. Coolant-through capability makes it well suited for CNC machining centers and gang drilling fixtures where through-spindle or through-tool coolant delivery is available. It is part of the MDW-HGS series, a line built around precision tolerances and consistent performance across production runs in metal fabrication and maintenance repair environments.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard-metal applications
• TiAlCr and TiSi dual coating for elevated heat resistance and extended tool life
• 135-degree point angle reduces thrust force and self-centers on entry
• Coolant-through design compatible with through-spindle coolant delivery systems
• Tapered web configuration supports chip flow and reduces torque demand
• h8 diameter tolerance for consistent fit in close-tolerance boring and drilling operations

Compatibility

Designed for use in cast iron, stainless steel, and carbon steel workpieces (material codes K, M, P, S). Fits standard 3/16-inch straight-cylindrical drill chucks and collet systems. Part of the SUMITOMO MDW-HGS series covering the 0.1500 to 0.2000 inch diameter range.

Installation Notes

This drill bit is intended for use by trained machinists and industrial maintenance technicians in CNC or manual drilling equipment. Ensure the spindle and workpiece are properly secured before operation and confirm that coolant supply is active if using through-tool coolant delivery. Solid carbide tooling is brittle and should not be used in setups with excessive runout or unstable fixturing, as lateral shock loads can cause chipping or breakage. Follow the machine manufacturer's recommended speeds and feeds for the workpiece material being drilled.