Sumitomo U101198 Jobber Drill Bit 17/32 in Solid Carbide

Product Description

The SUMITOMO U101198 is a jobber-length, solid carbide drill bit designed for high-performance metal cutting in demanding shop and production environments. Measuring 17/32 inch (0.5313 inch) in diameter with a 135-degree split-point geometry, the bit generates less thrust on entry and reduces the need for center-punching. A dual-layer TiAlCr and TiSi coating provides thermal resistance and edge hardness suited to high-speed cutting. Overall length is 5.7874 inches, with a straight-cylindrical shank diameter of 0.5469 inches. This bit is installed by machinists and metalworking tradespeople operating CNC machining centers, drill presses, and manual milling setups.

The U101198 belongs to SUMITOMO's MDW-GS series, engineered specifically for cutting cast iron and steel. The 4xD flute-to-diameter ratio and tapered web configuration promote chip evacuation and reduce walking in deep-hole applications. With a flute length of 3.3071 inches and a shank length of 2.4016 inches, the bit fits standard drill chucks and tool holders sized for the 0.5000 to 0.6500 inch diameter range. This is a solid carbide tool without coolant-through capability, suited for dry or flood-coolant external setups.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous metal cutting
• TiAlCr and TiSi dual-layer coating for elevated thermal stability and extended tool life
• 135-degree drill point angle reduces entry thrust and minimizes workpiece deformation
• Tapered web configuration promotes chip flow and reduces core-loading in deep cuts
• 4xD flute-by-diameter ratio for effective chip evacuation in steel and cast iron
• Diameter tolerance h8 ensures consistent fit in precision tool holders and drill chucks

Compatibility

Designed for use in the MDW-GS series, compatible with workpiece materials coded K (cast iron) and P (steel). Fits tool holders and drill chucks accepting straight-cylindrical shanks in the 0.5000 to 0.6500 inch diameter range.

Installation Notes

This bit should be installed by a qualified machinist familiar with carbide tooling. Secure the straight-cylindrical shank fully in a matching drill chuck or collet holder before operation. Carbide is brittle — avoid side-loading, interrupted cuts without proper setup, or over-tightening that can crack the shank. Always verify spindle speed and feed rate are appropriate for the workpiece material before starting the cut.