Sumitomo U101161 Screw Machine Drill Bit 13/32 in Carbide

Product Description

The SUMITOMO U101161 is a solid carbide screw machine length drill bit designed for high-performance drilling in demanding metalworking applications. It measures 13/32 inch (0.4062 inch) in diameter with an overall length of 4.5669 inches and a 135-degree web-thinned point geometry that promotes accurate entry and reduces thrust. The DEX multi-layer coating improves wear resistance and extends tool life in abrasive materials. Two regular spiral flutes channel chips efficiently, while coolant-through capability supports high-speed, deep-hole operations. This bit is suited for production environments where dimensional consistency and tool longevity are critical priorities.

The U101161 is engineered for machining steel, stainless steel, cast iron, and high-temperature alloys. Its screw machine length profile makes it a practical choice for CNC machining centers, drill presses, and turret lathes where rigidity and minimal overhang are priorities. The straight cylindrical shank at 0.4375 inch diameter fits standard collets and chucks. With a maximum drilling depth of 1.4580 inches and a flute-by-diameter ratio of 3xD, this bit performs reliably in short-hole production drilling on ferrous and exotic alloy workpieces.

Key Features

• Solid carbide construction for maximum rigidity and wear resistance in hard materials
• DEX multi-layer proprietary coating extends tool life and reduces heat buildup
• 135-degree web-thinned point for self-centering entry and reduced feed force
• Coolant-through design supports high-speed drilling and chip evacuation in deep holes
• Tapered web configuration paired with 2-margin geometry for stable, accurate hole production
• Diameter tolerance h8 ensures consistent fit and repeatable hole quality

Compatibility

Designed as a screw machine length replacement or production drill for use in steel, stainless steel, cast iron, and high-temperature alloy applications in CNC and manual machining setups. Part of the SUMITOMO MDW-HGS series.

Installation Notes

Installation and tool changes should be performed by a qualified machinist with the spindle fully stopped and locked out. Verify that the collet or chuck bore matches the 0.4375 inch straight shank diameter before tightening. Confirm coolant-through pressure settings are appropriate for the machine spindle before engaging the coolant circuit. Follow shop safety procedures and applicable OSHA machine guarding requirements when operating drill presses or machining centers.