Sumitomo U101052 Screw Machine Drill Bit 13/64 Solid Carbide

Product Description

The SUMITOMO U101052 is a screw machine length drill bit designed for high-performance drilling in demanding metal fabrication and machining applications. Built from solid carbide with a coated finish, this bit delivers the rigidity and heat resistance needed when drilling cast iron, stainless steel, and carbon steel. The 135-degree split-point geometry reduces thrust and self-centers on entry without a pilot hole. At 13/64 inch (0.2031 inches) in diameter, it fits standard toolholders with a straight-cylindrical shank. Coolant-through capability supports high-speed operations where chip evacuation and thermal management are critical. The bit belongs to the MDW-HGS series and is sized for stub-length drilling tasks on CNC machining centers and drill presses.

This bit is suited for production drilling in job shops, manufacturing facilities, and maintenance environments where ferrous metals are the primary workpiece material. The screw machine (stub) length geometry provides added rigidity over jobber-length bits, reducing deflection in short-hole applications. Primary workpiece materials include cast iron, stainless steel, and steel. The 3xD flute-to-diameter ratio and tapered web configuration support consistent chip flow and bit stability across those materials. Machinists and tool-and-die technicians working in production runs will find the coolant-through design compatible with through-spindle coolant delivery systems.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous metal drilling
• 135-degree point angle with tapered web for reduced entry thrust and self-centering
• Coolant-through design for chip evacuation and thermal control at the cutting edge
• Straight-cylindrical shank fits standard ER collets and drill chucks
• Screw machine (stub) length reduces deflection compared to jobber-length bits
• h8 diameter tolerance ensures consistent fit in precision toolholding systems

Compatibility

Designed for use with cast iron, stainless steel, and steel workpieces. Fits toolholders accepting a straight-cylindrical shank in the 13/64 inch diameter range (0.2000 to 0.2500 inches). Compatible with through-spindle coolant delivery when paired with an appropriate toolholder.

Installation Notes

Installation and use should be performed by a qualified machinist familiar with CNC or manual drilling equipment. Confirm spindle RPM and feed rate are appropriate for solid carbide tooling in the target workpiece material before engaging the cut. Ensure the toolholder and collet are clean and properly torqued before operation. When using coolant-through capability, verify coolant pressure and flow rate are within the machine spindle specifications to avoid thermal shock to the carbide substrate.