Sumitomo U101072 Mechanics Drill Bit 0.25 in Carbide

Product Description

The SUMITOMO U101072 is a solid carbide mechanics-length drill bit designed for high-performance drilling in demanding materials. It carries a TiAlCr/TiSi dual-layer coating that reduces heat buildup and extends tool life in abrasive applications. The bit has a 0.25-inch (6.35 mm) cutting diameter, a 135-degree split-point tip for accurate self-starting entry, and a tapered web configuration that improves chip evacuation and cutting stability. Overall length is 3.2677 inches with a flute length of 1.6535 inches. This is a single-piece tool intended for production and maintenance environments where consistent hole quality and tool longevity are priorities.

The U101072 is suited for machining cast iron, non-ferrous metals, stainless steel, and carbon steel in both shop and field applications. The mechanics-length body keeps the bit rigid in close-clearance work, making it a practical choice for equipment repair, fabrication, and general metalworking. The 0.2812-inch shank diameter is compatible with standard drill chucks and collet holders used in CNC machines, drill presses, and handheld power drills. No coolant-through capability is present, so flood or mist coolant applied externally is the appropriate cooling method in high-cycle operations.

Key Features

• Solid carbide construction for hardness and wear resistance in ferrous and non-ferrous materials
• TiAlCr/TiSi coating reduces friction and thermal load at the cutting edge
• 135-degree drill point angle for accurate, self-starting entry without a center punch in most applications
• Tapered web design promotes reliable chip evacuation and reduces walking
• Mechanics length provides added rigidity compared to jobber-length bits in tight spaces
• Part of the MDW-GS4 series for consistent performance across matched tooling setups

Compatibility

Designed for use in cast iron, non-ferrous metal, stainless steel, and steel workpieces. Compatible with standard drill chucks and collet holders accepting a 0.2812-inch shank.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or trade professionals familiar with cutting tool speeds and feeds for solid carbide tooling. Always verify that the machine spindle and chuck are free of runout before seating the bit, as carbide is brittle and sensitive to lateral load. Secure the shank fully in the chuck or collet to the recommended engagement depth for the holder type in use. Since this bit has no coolant-through channel, apply external flood or mist coolant to prevent heat buildup during extended or high-cycle drilling.