Sumitomo U101297 Extra Length Drill Bit 5/16 Solid Carbide

Product Description

The SUMITOMO U101297 is a solid carbide extra length drill bit engineered for deep hole drilling applications. It measures 0.3125 inches in diameter with a 140-degree drill point angle, a 4.331-inch flute length, and a 6.496-inch overall length. The DEX coating finish extends tool life in demanding materials. A straight-cylindrical shank with a 0.3150-inch shank diameter ensures secure, concentric chuck engagement. The tapered web configuration and two-flute geometry promote chip evacuation in deep-hole work. Coolant-through capability supports high-performance drilling by delivering cutting fluid directly to the tip, reducing heat buildup and extending tool life in difficult-to-machine materials.

This drill bit is designed for deep hole drilling in ductile iron and similarly demanding ferrous materials. The MDW-XHV series targets applications where flute-to-diameter ratios of 12xD are required, meaning the flute length supports drilling depths proportional to that ratio. It is suited for production machining environments where precision tolerances and consistent chip removal are critical. Machinists and tool-and-die professionals working with CNC machining centers will find this bit appropriate for operations requiring tight diameter tolerances and extended reach into the workpiece.

Key Features

• Solid carbide construction provides hardness and wear resistance for extended tool life in ferrous materials
• DEX coating finish reduces friction and heat at the cutting edge
• Coolant-through design delivers fluid directly to the drill tip during deep hole operations
• 140-degree drill point angle suited for ductile iron and hard ferrous workpiece materials
• Tapered web configuration supports chip flow and reduces thrust in deep hole drilling
• 12xD flute-to-diameter ratio allows drilling depths up to 4.449 inches

Compatibility

Designed for use in CNC machining centers and precision drilling equipment capable of coolant-through tool delivery, within the SUMITOMO MDW-XHV series for deep hole drilling in ductile iron and similar primary workpiece materials.

Installation Notes

This drill bit should be installed by a qualified machinist following the machine tool manufacturer specifications for toolholder and chuck runout. Verify coolant-through pressure settings are appropriate for the drilling depth before beginning the operation. Inspect the cutting edge and coating for damage before each use. Follow all applicable shop safety procedures and machine guarding requirements when operating drilling equipment.