Sumitomo U101163 Extra Length Drill Bit 0.1575 in Carbide

Product Description

The SUMITOMO U101163 is a solid carbide extra length drill bit engineered for deep hole drilling in demanding metalworking applications. It measures 0.1575 inches (4.00 mm) in diameter with a flute length of 3.4646 inches (88.00 mm) and an overall length of 139.00 mm. The bit features a 140-degree drill point angle and a tapered web configuration that supports chip evacuation and point stability in deep-bore work. The DEX coating improves wear resistance and thermal performance. The straight-cylindrical shank at 0.1575 inches diameter allows direct chuck mounting on standard machining centers and drill presses. This bit is sized in the MDW-XHV series and is intended for installation and use by machinists and tooling professionals.

This drill bit is designed for deep hole drilling operations with a flute-by-diameter ratio of 20xD, supporting drilling depths up to 91.00 mm. Primary workpiece materials include ductile iron and hardened steel, making this bit suitable for production machining environments where material hardness and hole depth exceed the capability of standard-length tooling. It is used in CNC machining centers, drill presses, and similar machine tool setups. Coolant-through capability supports internal coolant delivery to the cutting zone, reducing heat buildup and extending tool life in continuous drilling cycles.

Key Features

• Solid carbide construction for rigidity and wear resistance in hardened and abrasive workpiece materials
• DEX finish coating for improved thermal and abrasion resistance at the cutting edge
• 140-degree drill point angle suited to harder ferrous materials including hardened steel
• Coolant-through design delivers cutting fluid directly to the drill tip during deep-hole operations
• 20xD flute-by-diameter ratio supports drilling depths up to 91.00 mm
• Tapered web configuration aids chip flow and point strength throughout the full flute length

Compatibility

Designed as an OEM-style replacement and production drill bit for machining operations involving ductile iron and hardened steel workpieces requiring deep hole capability in the MDW-XHV series.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists familiar with carbide tooling requirements. Ensure the machine spindle, collet, or chuck is clean and properly sized to accept a 0.1575-inch straight-cylindrical shank before mounting. Carbide tooling is brittle and should not be subjected to interrupted cuts or side loads beyond the design intent of the series. Verify coolant-through supply is active and at adequate pressure before beginning deep-hole drilling cycles to prevent thermal damage to the cutting edge.