Sumitomo U101016 Solid Carbide Drill Bit 0.125 in

Product Description

The SUMITOMO U101016 is a screw machine length drill bit designed for high-performance metal drilling in professional machining and fabrication applications. Built from solid carbide with a coated finish, this bit measures 0.125 inches (1/8 inch) in diameter and features a 135-degree split-point angle that reduces walking and improves hole entry accuracy. The two-flute, tapered-web geometry promotes efficient chip evacuation. At 1.7717 inches overall length with a 0.5118-inch flute length, it is sized for close-tolerance work in screw machine and short-hole drilling setups. Machinists, tool-and-die technicians, and CNC operators are the primary installers of this bit.

The U101016 is suited for drilling cast iron and steel in both production and maintenance environments. The screw machine length profile makes it well-matched to turret lathes, automatic screw machines, and CNC machining centers where rigidity and minimal overhang are priorities. The h8 diameter tolerance ensures consistent fit in precision toolholding systems. This bit does not feature coolant-through capability, so external coolant or cutting fluid application is recommended when drilling steels at depth.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous materials
• 135-degree drill point angle reduces thrust force and minimizes entry walking
• Two-flute tapered-web design promotes chip flow in blind and through holes
• Straight-cylindrical shank compatible with standard drill chucks and collets
• h8 diameter tolerance for close-fit toolholding and repeatable hole size
• Screw machine length geometry provides maximum rigidity in short-hole applications

Compatibility

Part of the MDW-GS series, this bit is designed for drilling cast iron and steel workpieces. It falls within the 0.1000 to 0.1500 inch drill bit size range of the MDW-GS product family.

Installation Notes

Installation and tool changes should be performed with the machine fully powered down and spindle at rest. Secure the straight-cylindrical shank in a properly sized collet or drill chuck torqued to the toolholder specification before operation. No coolant-through feature is present on this bit, so apply external cutting fluid or coolant at the cutting zone when drilling steel to extend tool life and prevent thermal damage. Inspect the cutting edges and shank for damage before each use.