Sumitomo U101015 Solid Carbide Screw Machine Drill Bit

Product Description

The SUMITOMO U101015 is a solid carbide screw machine length drill bit designed for precision drilling in metalworking applications. It measures 0.12 inches (3.05 mm) in diameter with a 135-degree split point angle and a two-flute, tapered web configuration. The straight-cylindrical shank seats securely in standard drill chucks and collets. At 1.7717 inches overall length with a 0.5118-inch flute length, this is a stub-length drill optimized for rigidity and accuracy in short-reach setups. It belongs to the MDW-GS series and features a coated finish to extend tool life in demanding cutting operations. Licensed machinists and CNC operators working in production environments are the primary users.

This drill bit is intended for use in screw machine operations, CNC machining centers, and manual drill press applications where a short, rigid tool is required. It is rated for primary workpiece materials including cast iron and steel. The 2xD flute-by-diameter ratio and tapered web configuration make it well-suited for spot drilling, through-hole drilling, and shallow-depth bores in ferrous materials. Maximum drilling depth is 0.3317 inches (8.43 mm). The h8 diameter tolerance ensures consistent fit and repeatable results in close-tolerance work.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous materials
• 135-degree drill point angle reduces walking and improves self-centering on entry
• Tapered web configuration supports chip evacuation in cast iron and steel
• Coated finish extends cutting edge life in production drilling environments
• Straight-cylindrical shank compatible with standard collets and drill chucks
• h8 diameter tolerance for consistent, repeatable bore sizing

Compatibility

Designed for use in screw machine operations and CNC drilling applications targeting cast iron and steel workpieces within the MDW-GS series drill bit family.

Installation Notes

This drill bit is installed and operated by machinists and CNC technicians. Secure the shank fully in the collet or chuck before operation and verify runout with a dial indicator where close tolerances are required. Follow machine manufacturer guidelines for spindle speed and feed rate based on workpiece material and drill diameter. Inspect the cutting edges for wear or chipping before each use and replace the bit if the coating is compromised or the point geometry is degraded.