Sumitomo U101144 Carbide Drill Bit 0.375 in 135 Deg Mdw-gs

Product Description

The SUMITOMO U101144 is a screw machine length drill bit engineered for demanding metal cutting applications. Built from solid carbide with a coated finish, this bit delivers high hardness and wear resistance in materials where high-speed steel tooling falls short. The 135-degree split-point geometry reduces thrust force and improves self-centering at entry. With an overall length of 3.4252 inches and a 0.375-inch diameter, it fits standard drill chucks and CNC machining centers using a straight-cylindrical shank. Licensed machinists, toolroom technicians, and CNC operators will find this bit suited to short-hole drilling cycles where rigidity and dimensional accuracy are critical.

The U101144 belongs to the MDW-GS series and is sized for drilling cast iron and steel workpieces. The screw machine length format keeps the bit compact for improved stiffness during cut, making it a common choice in production machining, job shop environments, and automated drilling stations where shorter flute-to-diameter ratios improve hole quality. The 2xD flute-to-diameter ratio and tapered web configuration support chip evacuation in blind and through-hole applications within its maximum drilling depth rating.

Key Features

• Solid carbide construction with coated finish for extended tool life in ferrous materials
• 135-degree drill point angle for reduced entry thrust and improved self-centering
• Screw machine length format provides increased rigidity over jobber-length equivalents
• Straight-cylindrical shank with h8 diameter tolerance for consistent chuck and collet fit
• 2-flute tapered web design promotes chip evacuation in cast iron and steel
• MDW-GS series with 2xD flute-by-diameter ratio optimized for short-depth hole cycles

Compatibility

Designed as an OEM-style replacement or direct-use solid carbide drill bit for production drilling operations in cast iron and steel, compatible with standard drill chucks, ER collets, and CNC tool holders accepting a straight-cylindrical shank in the 0.375-inch diameter range.

Installation Notes

Installation and tool changes should be performed by qualified machinists or CNC operators with the spindle fully stopped and the machine in a safe, locked-out state. Ensure the chuck or collet is clean and properly torqued before running the spindle. Carbide tooling is brittle — avoid side loads, interrupted cuts beyond the tool rating, or dropping the bit on hard surfaces. Follow the machine tool manufacturer and applicable shop safety guidelines for speeds and feeds when setting up a new drilling cycle.