Sumitomo U103689 Jobber Drill Bit 13/64 Solid Carbide

Product Description

The SUMITOMO U103689 is a solid carbide jobber length drill bit designed for precision metal cutting in demanding industrial and machining applications. It measures 13/64 inch (0.2031 inches) in diameter and features a 135-degree drill point angle, which reduces walking on entry and suits flat or curved workpiece surfaces. The bit carries a dual TiAlCr and TiSi coating that improves heat resistance and extends tool life at elevated cutting speeds. Overall length is 3.937 inches with a straight-cylindrical shank diameter of 0.2344 inches. This bit belongs to the MDW-HGS series and is installed by machinists and CNC operators working in high-production metal cutting environments.

This drill bit is engineered for cutting cast iron, stainless steel, and steel, corresponding to ISO workpiece material codes K, M, P, and S. The 5xD flute-to-diameter ratio and tapered web configuration support chip evacuation in deeper holes. Coolant-through design allows internal coolant delivery directly to the cutting edge, making it well suited for machining centers and CNC lathes equipped with through-spindle coolant systems. It is appropriate for both general-purpose shop use and high-volume production runs where consistent hole tolerance and tool life matter.

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 split point angle reduces entry walking and thrust force
• Coolant-through design supports internal coolant delivery to the cutting zone
• Tapered web and 5xD flute ratio promote efficient chip evacuation
• Straight-cylindrical shank compatible with standard drill chucks and collet systems

Compatibility

Designed for use on cast iron, stainless steel, and steel workpieces (ISO material codes K, M, P, S) in machining centers, CNC mills, and drill presses equipped with through-spindle or external coolant. Fits standard chucks and collets accepting a 0.2344-inch straight-cylindrical shank. Part of the SUMITOMO MDW-HGS series.

Installation Notes

Installation and setup should be performed by a qualified machinist or CNC operator. Ensure the spindle is fully stopped and the machine is in a safe, locked-out state before loading or changing the bit. Seat the shank fully and evenly in the collet or drill chuck and verify runout before commencing a cut. Confirm coolant flow path is clear before engaging through-spindle coolant if applicable.