Sumitomo U101064 Screw Machine Drill Bit 15/64 in

Product Description

The SUMITOMO U101064 is a solid carbide screw machine length drill bit designed for high-productivity drilling in metalworking applications. It measures 15/64 inch (0.2344 inch) in diameter with an overall length of 2.5591 inches and a flute length of 1.0630 inches. The 135-degree split point geometry reduces walking and improves entry accuracy on flat or curved surfaces. Solid carbide construction delivers greater rigidity and heat resistance compared to high-speed steel, making it well suited for consistent, repeatable hole production on harder workpiece materials. This bit is sized to h8 diameter tolerance, supporting close-tolerance bore work.

The U101064 is intended for use in cast iron and steel workpieces, covering a broad range of ferrous machining tasks common in manufacturing, fabrication, and maintenance environments. The screw machine (stub) length format provides added rigidity over jobber-length bits, which reduces deflection during entry and through-feed. It is typically used in CNC machining centers, drill presses, and turret lathes where short-reach tooling is specified. The straight-cylindrical shank is compatible with standard drill chucks and collet holders in the matching shank diameter. Coolant-through capability is not included on this model.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous materials
• 135-degree point angle reduces thrust and minimizes drill walk on entry
• Screw machine (stub) length format at 2.5591 inches OAL for maximum rigidity
• Tapered web configuration improves chip evacuation and cutting efficiency
• h8 diameter tolerance supports close-tolerance hole requirements
• 2xD flute-by-diameter ratio with a maximum drilling depth of 0.7116 inches

Compatibility

Part of the MDW-GS series, the U101064 is designed for drilling cast iron and steel and fits standard drill chucks or collet systems accepting a 0.2344-inch straight-cylindrical shank. It covers the 0.2000 to 0.2500 inch drill bit size range designation for this series.

Installation Notes

This bit is installed and serviced by machinists and tool-and-die professionals. Ensure the spindle is fully stopped and locked out before changing tooling. Secure the shank fully in the chuck or collet and verify runout before engaging the cut. Do not exceed the recommended maximum drilling depth of 0.7116 inches per pass without retracting to clear chips, as this bit does not include coolant-through capability.