Sumitomo U101199 Screw Machine Drill Bit 17/32 in Carbide

Product Description

The SUMITOMO U101199 is a solid carbide screw machine length drill bit designed for high-performance drilling in demanding metal-cutting applications. It features a 17/32 inch (0.5313 inch) diameter, a 135-degree split point, and a straight-cylindrical shank with an h8 diameter tolerance for consistent, accurate fitment in standard chucks and toolholders. The overall length is 5.2756 inches with a flute length of 2.6575 inches. Built from solid carbide throughout, this bit delivers the rigidity and wear resistance required for production drilling in ferrous and stainless materials. Coolant-through capability supports high-speed cycles where chip evacuation and heat management are critical. This tool is intended for use by machinists and CNC tool-room technicians in production or job-shop environments.

The U101199 is suited for drilling cast iron, stainless steel, and carbon steel in both manual and CNC machine tool setups. The screw machine length geometry — shorter than jobber length — provides added rigidity and reduced deflection, making it appropriate for close-tolerance hole production on machining centers, drill presses, and CNC lathes. The MDW-HGS series designation identifies this as part of Sumitomo's high-geometry solid carbide stub drill lineup. Maximum drilling depth is 1.8615 inches, positioning it well for through-holes and shallow blind-holes in production fixtures.

Key Features

• Solid carbide construction for rigidity and extended tool life in ferrous materials
• 135-degree split point reduces thrust load and improves self-centering on entry
• Coolant-through design supports high-speed drilling and efficient chip evacuation
• Screw machine length body minimizes deflection in short-reach drilling applications
• Tapered web configuration with 2 flutes and 2 margins for stable cutting geometry
• h8 shank diameter tolerance ensures consistent seating in precision toolholders

Compatibility

Designed for use in standard straight-shank drill chucks and collet-style toolholders accepting a 0.5469 inch shank diameter. Primary workpiece materials listed by the manufacturer are cast iron, stainless steel, and steel. Compatible with CNC machining centers, knee mills, and drill presses equipped for coolant-through tooling.

Installation Notes

Installation and tool changes must be performed with the machine fully powered down and the spindle locked. Secure the shank fully within the chuck or collet to the recommended grip depth before tightening. Verify coolant-through passages are clear and that the machine tool's coolant supply pressure is compatible with the toolholder before running. Solid carbide tooling is brittle — avoid lateral loading or using a worn, out-of-round chuck that could cause chipping at the cutting edge.