Sumitomo U103742 Jobber Drill Bit 31/64 in Solid Carbide

Product Description

The SUMITOMO U103742 is a solid carbide jobber length drill bit designed for high-performance metal cutting in demanding industrial and machining applications. It measures 31/64 inch (0.4844 inch) in diameter and features a 135-degree drill point angle for accurate self-centering starts with reduced thrust. The bit carries a dual TiAlCr and TiSi coating that improves heat resistance and edge retention at elevated cutting speeds. Overall length is 6.5748 inches with a straight-cylindrical shank of 0.5156 inch diameter. Licensed machinists, tool-and-die workers, and CNC operators are the primary installers of this tooling.

The U103742 is suited for cutting cast iron, stainless steel, carbon steel, and other ferrous alloys. The MDW-HGS series designation identifies it as a high-geometry, through-coolant capable drill, making it appropriate for CNC machining centers and drill presses where pressurized coolant delivery is available. The 5xD flute-to-diameter ratio supports chip evacuation in deeper bore applications common in production-volume metal fabrication and tool shops working with difficult-to-machine materials such as stainless and alloy steels.

Key Features

• Solid carbide construction for rigidity and heat resistance in ferrous metal cutting
• Dual TiAlCr and TiSi coating extends tool life in high-speed and dry-cutting conditions
• 135-degree split point angle reduces walking and lowers required thrust force
• Through-coolant capable design supports pressurized coolant delivery for deep-hole drilling
• 5xD flute-to-diameter ratio promotes chip evacuation in longer bore passes
• Tapered web configuration adds core strength while maintaining cutting efficiency

Compatibility

Designed for use in CNC machining centers and drill presses that accept a 0.5156-inch straight-cylindrical shank; primary workpiece material compatibility includes cast iron, stainless steel, and carbon and alloy steels (material codes K, M, P, and S).

Installation Notes

This tooling is installed and operated by qualified machinists and CNC programmers following shop-floor tooling change procedures. Verify that the machine spindle or chuck is rated for the shank diameter before mounting. Disengage machine power and allow the spindle to come to a full stop before inserting or removing the bit. Follow the tool manufacturer and machine builder guidelines for speeds, feeds, and coolant pressure when running through-coolant tooling.