Sumitomo U101028 Screw Machine Drill Bit 5/32 in Carbide

Product Description

The SUMITOMO U101028 is a screw machine length drill bit engineered for high-precision drilling in demanding metalworking applications. Built from solid carbide, it delivers the rigidity and wear resistance required when drilling cast iron, stainless steel, and steel. The bit features a 135-degree split-point geometry that reduces walking on entry and lowers thrust force across the cut. At 2.8346 inches overall length with a flute length of 0.8858 inches, the compact stub format is optimized for stiffness in short-reach drilling setups. Coolant-through design supports high-speed operation and chip evacuation in production environments.

This bit is suited for CNC machining centers, drill presses, and automated production cells where screw machine length tooling is specified. The straight-cylindrical shank seats securely in standard drill chucks and collet holders. Primary workpiece materials include cast iron, stainless steel, and steel, making it appropriate for general metalworking, fabrication shops, and maintenance machining operations. The MDW-HGS series designation indicates this is part of a high-performance carbide stub drill line intended for controlled, coolant-fed drilling programs.

Key Features

• Solid carbide construction for hardness and thermal resistance in metal drilling
• 135-degree drill point angle reduces thrust and minimizes entry walking
• Coolant-through design supports chip flushing and heat management at depth
• Screw machine length format provides added stiffness versus jobber-length bits
• Tapered web configuration with 2 flutes and 2 margins for accurate hole geometry
• h8 diameter tolerance on shank ensures consistent chuck or collet fit

Compatibility

Designed as an OEM-style production drill in the SUMITOMO MDW-HGS series, suitable for straight-shank drill chucks and collet toolholders accepting a 0.1562-inch shank diameter. Rated for primary workpiece materials including cast iron, stainless steel, and steel.

Installation Notes

Installation and use should be performed by qualified machinists or tooling technicians familiar with carbide cutting tools. Before tool changes, de-energize the machine spindle and confirm the tool is fully secured in the chuck or collet to the specified gripping depth. Carbide tooling is brittle and should not be subjected to lateral shock or interrupted cuts beyond the tool's rated application. Always verify coolant flow is active before initiating a drilling cycle when using the through-coolant feature.