Sumitomo U101122 Solid Carbide Screw Machine Drill Bit 0.332in

Product Description

The SUMITOMO U101122 is a solid carbide screw machine length drill bit designed for high-performance drilling in demanding shop and field applications. Part of the MDW-GS series, it features a 0.332 inch (Letter Q) diameter with a 135-degree split-point geometry and a tapered web configuration. The straight-cylindrical shank seats securely in standard chucks and collets. At 3.2283 inches overall length with a 1.4173 inch flute length, this stub-length format delivers rigidity and reduced deflection compared to jobber-length bits. Solid carbide construction with a coated finish supports extended tool life when cutting hard or abrasive workpiece materials.

The U101122 is suited for drilling cast iron and steel in production machining, maintenance, and repair environments. The screw machine length profile makes it a practical choice for CNC machining centers, turret lathes, and drill presses where short-flute stability matters. A 2xD flute-to-diameter ratio and a maximum drilling depth of 0.9195 inches keep chip evacuation efficient in through-hole and shallow blind-hole operations. No coolant-through capability means it performs best with external coolant application or dry cutting at appropriate feed and speed parameters.

Key Features

• Solid carbide construction with coated finish for wear resistance in cast iron and steel
• 135-degree drill point angle reduces walking and thrust force at entry
• Tapered web design supports aggressive chip formation and efficient flute clearance
• Screw machine (stub) length format provides superior rigidity and reduced deflection
• Straight-cylindrical shank with h8 diameter tolerance for precise chuck or collet fit
• 2xD flute-to-diameter ratio optimized for shallow-depth drilling applications

Compatibility

Designed as an OEM-style replacement or direct-use solid carbide drill bit for production and maintenance drilling operations in cast iron and steel workpieces requiring a 0.332 inch hole diameter.

Installation Notes

This drill bit is installed and operated by machinists and tool-and-die professionals using standard drill chucks, collets, or hydraulic toolholders rated for the shank diameter. Ensure the machine spindle and toolholder are clean and true before seating the shank. Apply appropriate cutting speeds and feed rates for solid carbide tooling in the target workpiece material. External coolant or cutting fluid is recommended where applicable since this bit does not feature coolant-through channels.