Sumitomo U101068 Screw Machine Drill Bit 0.242 in Carbide

Product Description

The SUMITOMO U101068 is a solid carbide screw machine length drill bit designed for high-performance drilling in ferrous and hard materials. Built to MDW-HGS series standards, it features a 135-degree split-point geometry and a straight-cylindrical shank for consistent runout and reliable chucking. The 0.242-inch diameter corresponds to Letter Size C. With coolant-through capability and a tapered web configuration, this bit maintains cutting efficiency in demanding production environments. Licensed HVAC, mechanical, and industrial maintenance technicians working with cast iron, stainless steel, and carbon steel will find this bit suited to precise, repeatable hole-making tasks.

This drill bit is intended for screw machine applications where short flute length and rigid geometry are required to control deflection in tough workpieces. Primary workpiece materials include cast iron, stainless steel, and steel. The 3xD flute-by-diameter ratio supports chip evacuation during moderate-depth drilling, and the coolant-through design allows internal coolant delivery for extended tool life in high-cycle production setups. It is commonly used in CNC machining centers, turret lathes, and drill presses in industrial and mechanical service environments.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous materials
• 135-degree split-point angle reduces thrust and improves self-centering on entry
• Coolant-through design supports internal coolant delivery for thermal management
• Tapered web with 2-margin geometry promotes stable cutting and chip clearance
• Straight-cylindrical shank fits standard drill chucks and collet holders
• h8 diameter tolerance ensures consistent fit and hole quality

Compatibility

Designed for use in drilling operations on cast iron, stainless steel, and steel workpieces. Compatible with drill chucks and collet systems accepting straight-cylindrical shanks in the 0.242-inch diameter range. Suitable for the 0.2000 to 0.2500 inch drill bit size range class.

Installation Notes

Installation and use should be performed by qualified machinists or tool-and-die professionals familiar with carbide tooling requirements. Ensure the spindle and chuck are properly secured and the workpiece is rigidly fixtured before drilling. Solid carbide bits are brittle compared to high-speed steel and require stable setups with minimal vibration to prevent chipping or fracture. Always verify coolant flow is active before engaging the cut when using the coolant-through feature.