Sumitomo U101085 Screw Machine Drill Bit 0.266 in Carbide

Product Description

The SUMITOMO U101085 is a screw machine length solid carbide drill bit designed for high-performance drilling in demanding metalworking applications. Built to MDW-HGS series specifications, it features a 0.266 inch (17/64 inch) diameter, a 135-degree drill point angle, and a straight-cylindrical shank. The solid carbide construction with coated finish delivers hardness and wear resistance needed for production drilling. Coolant-through capability supports heat management at the cutting zone, extending tool life in high-speed operations. This bit is suited for machinists and tool-room technicians working with precision drilling setups on CNC machines and manual drill presses.

The U101085 is engineered for drilling cast iron, stainless steel, and steel. Its screw machine length profile — shorter than jobber length — provides increased rigidity and reduced deflection, making it well suited for tight-tolerance holes in production environments. The 3xD flute-to-diameter ratio and tapered web configuration support efficient chip evacuation and consistent hole geometry across repeated cycles. This bit fits standard drill chucks accepting a straight-cylindrical shank and is packaged as a single unit.

Key Features

• Solid carbide construction with coated finish for extended wear resistance in ferrous materials
• 135-degree split-point geometry reduces walking and lowers entry force on hard metals
• Coolant-through design channels fluid directly to the cutting edge for thermal control
• Screw machine length body improves rigidity and minimizes deflection versus jobber-length bits
• Tapered web with 2 flutes and 2 margins supports chip flow and hole finish quality
• h8 diameter tolerance ensures consistent fit in precision toolholding systems

Compatibility

Designed for use in CNC machining centers, drill presses, and similar equipment with straight-cylindrical shank toolholding. Primary workpiece materials are cast iron, stainless steel, and steel, consistent with MDW-HGS series application intent.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or toolroom technicians familiar with cutting tool setup and machine operation. Secure the shank fully in a compatible drill chuck or collet before operation and verify runout is within acceptable limits. Always engage coolant-through supply before beginning the cut when using the internal coolant feature. Inspect the cutting edge for wear or chipping before each use and remove from service if damage is present.