Sumitomo U101277 Extra Length Drill Bit 0.1719 in Solid Carbide

Product Description

The SUMITOMO U101277 is a solid carbide extra length drill bit engineered for deep hole drilling applications in demanding metalworking environments. With a diameter of 0.1719 inches and an overall length of 4.607 inches, this bit is built for reaching depth without sacrificing rigidity. The 140-degree split point reduces thrust and improves self-centering on entry. DEX coating provides enhanced wear resistance and heat dissipation during high-cycle operations. The straight-cylindrical shank and tapered web configuration contribute to stable cutting geometry and chip evacuation. This is a production-grade tooling component installed by machinists and tool-and-die professionals.

The U101277 is designed for deep hole drilling into ductile iron and hardened steel at a flute-by-diameter ratio of 12xD. The 2.52-inch flute length handles a maximum drilling depth of 2.638 inches, making it well suited for through-hole and blind-hole work on CNC machining centers and drill presses where coolant-through capability is utilized. It fits applications where tight diameter tolerance control is critical, with a drill bit diameter tolerance of -0.00080 to -0.00145 inches.

Key Features

• Solid carbide construction for extended tool life in ferrous materials
• DEX coating reduces friction and extends wear resistance in high-cycle drilling
• 140-degree drill point angle improves self-centering and reduces entry thrust
• Coolant-through design supports chip flushing in deep hole operations
• Tapered web configuration promotes efficient chip evacuation
• 12xD flute-to-diameter ratio enables deep reach in a compact shank

Compatibility

Designed for use in CNC machining centers and drill presses accepting a 0.2360-inch straight-cylindrical shank, targeting deep hole drilling operations in ductile iron and hardened steel workpieces per MDW-XHV series specifications.

Installation Notes

Installation and tool changes should be performed by qualified machinists following standard machine lockout and spindle-stop procedures before handling. Confirm shank diameter and collet or chuck specifications match before seating the bit. Coolant-through setups should be verified for adequate pressure and flow before running at production feed and speed rates. Avoid side loading or using the bit as a reamer, as solid carbide is brittle under lateral force.