Sumitomo U101031 Solid Carbide Drill Bit 0.159 in

Product Description

The SUMITOMO U101031 is a screw machine length drill bit built for precision drilling in demanding trade and industrial applications. Manufactured from solid carbide with a coated finish, this bit measures 0.159 inches in diameter and features a 135-degree drill point angle for accurate, self-centering starts with minimal walking. The straight-cylindrical shank and tapered web configuration support rigid tool holding and efficient chip evacuation. With coolant-through capability, it is suited for use in CNC machining centers and production drilling environments where heat management is critical. The two-flute design paired with two margins delivers clean, consistent hole geometry in tough materials.

This drill bit is designed for production and job shop environments drilling into cast iron, stainless steel, and steel. Its screw machine length profile makes it a fit for tight-clearance setups and short-reach applications where stub-length rigidity is needed without sacrificing reach. The MDW-HGS series designation indicates this is a high-performance geometry bit intended for controlled, repeatable drilling cycles rather than hand-held or light-duty use. Machinists, tool and die technicians, and production drilling operators are the typical end users.

Key Features

• Solid carbide construction for superior hardness and wear resistance in ferrous materials
• 135-degree split-point geometry reduces thrust and eliminates the need for a center punch on most setups
• Coolant-through design channels fluid directly to the cutting edge for extended tool life in deep-hole applications
• Tapered web with two margins promotes straightness and hole roundness
• Straight-cylindrical shank fits standard ER collets and drill chucks without adapters
• Flute-to-diameter ratio of 3xD supports maximum drilling depth of 0.7458 inches

Compatibility

Designed as an OEM-style screw machine length carbide drill for use in CNC machining centers, drill presses, and turret lathes configured for straight-shank tooling in the 0.1500 to 0.2000 inch diameter range.

Installation Notes

Installation and use should be performed by qualified machinists or tooling technicians familiar with CNC setup and cutting tool protocols. Ensure the spindle is fully stopped and the machine is in a safe state before loading or removing the bit from the tool holder. Verify collet or chuck bore matches the straight-cylindrical shank diameter and that runout is within acceptable limits before beginning a drilling cycle. Follow machine manufacturer guidelines and applicable shop safety standards when programming feed and speed parameters for the workpiece material.