Sumitomo U101184 Solid Carbide Drill Bit 0.5 in 135

Product Description

The SUMITOMO U101184 is a solid carbide screw machine length drill bit designed for precision drilling in ferrous and cast iron materials. Measuring 0.5 inches in diameter with a 135-degree split point, this bit reduces walking and minimizes the need for a center punch on hard surfaces. The two-flute, tapered-web geometry promotes efficient chip evacuation, while the coated finish extends tool life under high-cycle production conditions. Overall length is 3.937 inches with a flute length of 1.929 inches. It carries an h8 diameter tolerance, making it suitable for close-tolerance bore applications. Machinists and tool-and-die professionals install this bit in CNC machining centers, drill presses, and screw machine setups.

This drill bit is suited for production environments where consistent hole quality in cast iron and steel workpieces is required. The screw machine length format provides added rigidity compared to jobber-length bits, reducing deflection in short-reach drilling operations. The straight cylindrical shank seats directly in standard collets and drill chucks without adapters. The MDW-GS series targets general-purpose metal cutting where dimensional accuracy and surface finish matter. Maximum drilling depth is 1.179 inches, which aligns with typical screw machine and short-cycle CNC applications.

Key Features

• Solid carbide construction for rigidity and wear resistance in steel and cast iron
• 135-degree drill point angle reduces entry force and minimizes workpiece marking
• Tapered web design promotes chip flow and reduces heat buildup at the cutting edge
• Coated finish extends tool life in high-cycle drilling applications
• h8 diameter tolerance supports close-tolerance and precision bore requirements
• Straight cylindrical shank fits standard collets and drill chucks without modification

Compatibility

Designed for use in CNC machining centers, drill presses, and screw machines accepting a 0.5-inch straight cylindrical shank; primary workpiece materials are cast iron and steel as specified by the manufacturer.

Installation Notes

Installation and tool changes should be performed by a qualified machinist with the spindle fully stopped and power isolated from the machine. Secure the shank fully within the collet or chuck to the recommended grip depth before tightening. Do not exceed the maximum drilling depth of 1.179 inches in a single pass without retracting to clear chips. Verify spindle speed and feed rate against the manufacturer cutting data for the target workpiece material before production use.