Sumitomo U101253 Extra Length Drill Bit 0.125 in Carbide

Product Description

The SUMITOMO U101253 is a solid carbide extra length drill bit engineered for deep hole drilling applications. Built to MDW-XHV series specifications, it features a 0.125 inch (1/8 inch) diameter, a 140-degree drill point angle, and a DEX coating finish. The two-flute, tapered-web geometry supports chip evacuation in demanding materials. Coolant-through capability delivers cutting fluid directly to the tip, managing heat and extending tool life during extended-reach cuts. This bit is designed for use by machinists and tool-and-die professionals working on precision components in production environments.

The U101253 is suited for deep hole drilling in ductile iron and similarly machinable ferrous workpiece materials. With a flute-to-diameter ratio of 12xD and a maximum drilling depth of 1.89 inches, it handles bores that exceed the reach of standard-length tooling. The straight-cylindrical shank fits conventional drill chucks and collet holders. Typical install scenarios include CNC machining centers and manual drill presses where tight diameter tolerances and controlled entry angles are required.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard and abrasive workpiece materials
• DEX coating finish reduces friction and extends cutting life in ductile iron and ferrous alloys
• Coolant-through design delivers fluid directly to the cutting zone for heat control and chip flushing
• 140-degree drill point angle optimized for self-centering entry and reduced thrust force
• 12xD flute-to-diameter ratio enables deep hole drilling beyond the capacity of jobber-length bits
• Tapered web configuration supports chip flow and reduces walking at drill entry

Compatibility

Designed as a precision deep hole drill in the MDW-XHV series, with primary workpiece material compatibility listed as ductile iron. Straight-cylindrical shank diameter of 0.157 inches fits standard collet chucks and drill holders accepting that shank size.

Installation Notes

Installation and use of this tooling should be performed by qualified machinists familiar with CNC or manual drilling operations. Ensure the machine spindle is at a full stop and all power is isolated before changing tooling or adjusting collet tension. Verify coolant-through supply pressure and flow rate are within the machine and tooling specifications before running. Inspect the cutting edges for chipping or wear before each use, as solid carbide is brittle and susceptible to breakage under side loading or interrupted cuts.