Sumitomo U101081 Mechanics Drill Bit 17/64 in Carbide

Product Description

The SUMITOMO U101081 is a solid carbide mechanics-length drill bit designed for high-performance drilling in demanding industrial and trade applications. Built to the MDW-GS4 series specification, this bit features a TiAlCr/TiSi coating that extends tool life and supports higher cutting speeds across a range of workpiece materials. The drill point angle is 135 degrees, which provides accurate self-centering and reduces walking on entry. The overall length is 3.2677 inches with a mechanics-length flute design suited for controlled, close-quarter drilling operations. Licensed machinists, tool-and-die technicians, and maintenance trades are the typical end users for this bit.

This drill bit is engineered for use on cast iron, non-ferrous metals, stainless steel, and carbon steel. The tapered web configuration helps with chip evacuation and reduces thrust force at the cutting edge. It is well suited to CNC machining centers, drill presses, and handheld power drills where a compact, mechanics-length bit is required. The 17/64 inch diameter (0.2656 inch decimal, 6.75 mm metric equivalent) and 0.2812 inch shank diameter make it a direct fit for standard drill chucks in both imperial and metric tooling setups.

Key Features

• Solid carbide construction for extended wear resistance and rigidity in hard materials
• TiAlCr/TiSi coating provides thermal protection and reduces built-up edge on stainless steel and cast iron
• 135-degree split point angle for accurate self-centering and reduced feed force
• Tapered web geometry improves chip evacuation and lowers heat buildup at depth
• Mechanics-length OAL of 3.2677 inches suits close-quarter and fixture drilling
• MDW-GS4 series rated for high-performance cutting on ferrous and non-ferrous workpieces

Compatibility

Suitable for use on cast iron, non-ferrous metal, stainless steel, and steel workpieces. Compatible with standard drill chucks accepting a 0.2812 inch shank diameter. No coolant-through capability; intended for dry or externally lubricated cutting environments.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance trades familiar with carbide tooling. Power down and de-energize all equipment before changing drill bits, and ensure the shank is fully seated and the chuck is securely tightened before operation. Solid carbide tooling is brittle and should not be subjected to side loads or impact; avoid using this bit in hammer-drill mode. Follow applicable shop safety standards and machine manufacturer guidelines for feed rate and spindle speed selection.