Sumitomo U101033 Solid Carbide Screw Machine Drill Bit

Product Description

The SUMITOMO U101033 is a solid carbide screw machine length drill bit designed for high-precision drilling in ferrous materials. Built on the MDW-GS series platform, this bit features a 135-degree split-point geometry and a tapered web configuration that reduces thrust and improves chip evacuation on entry. The drill measures 0.166 inches (4.22 mm) in diameter with an overall length of 2.4016 inches and a flute length of 0.9055 inches. The straight-cylindrical shank and h8 diameter tolerance make it suitable for precision toolholders and drill chucks in CNC and manual machine applications. At 0.05 pounds, it is a compact, single-piece solid carbide tool intended for production environments.

This drill bit is engineered for use on cast iron and steel workpieces in screw machine, CNC lathe, and machining center applications. The screw machine length designation indicates a shorter, stiffer flute geometry optimized for rigidity and accuracy in high-cycle production drilling. The 2xD flute-by-diameter ratio and a maximum drilling depth of 0.6563 inches (16.67 mm) make it well suited to shallow-to-moderate depth hole applications where tight tolerances are required. Machinists, tool and die professionals, and CNC operators in metalworking shops are the primary users of this type of bit.

Key Features

• Solid carbide construction delivers hardness and wear resistance for steel and cast iron drilling
• 135-degree split-point angle reduces walking and decreases thrust on entry
• Tapered web configuration improves chip flow and cutting stability
• Straight-cylindrical shank with h8 tolerance fits standard precision chucks and toolholders
• Screw machine length body provides added rigidity compared to jobber-length bits
• 2xD flute ratio supports efficient chip evacuation in short-depth holes

Compatibility

Designed as an OEM-style replacement and production drill bit for use in screw machines, CNC machining centers, and manual drill presses capable of accepting a straight-cylindrical shank drill in the 0.1500 to 0.2000 inch (3.50 to 5.00 mm) diameter range.

Installation Notes

Installation is performed by qualified machinists or CNC setup technicians. Power down and lock out the machine before inserting or removing tooling. Ensure the shank is fully seated and the chuck or collet is torqued to the toolholder manufacturer specification. Do not exceed the recommended maximum drilling depth of 0.6563 inches for this bit without verifying chip clearance and coolant strategy, noting that this series does not support coolant-through delivery.