Sumitomo U101127 Carbide Jobber Drill Bit 8.61mm 135deg

Product Description

The SUMITOMO U101127 is a solid carbide jobber length drill bit designed for precision metal cutting in demanding machining applications. It measures 8.61 mm (0.3390 inches) in diameter with a 135-degree drill point angle, an overall length of 3.8583 inches, and a straight-cylindrical shank diameter of 0.3594 inches. The bit carries a dual TiAlCr and TiSi coating that improves surface hardness and heat resistance during high-speed drilling. With two flutes and a tapered web configuration, it is suited for machinists and toolroom technicians working on ferrous metals and cast components.

This drill bit is built for metal cutting applications, specifically targeting cast iron and steel workpieces. The 4xD flute-to-diameter ratio provides sufficient chip evacuation during moderate-depth drilling passes. The MDW-GS series designation places it within a category of general-purpose solid carbide drills optimized for stable, repeatable hole quality in production and maintenance machining environments. It is sold individually and is appropriate for CNC machining centers, drill presses, and manual lathes with appropriate toolholding.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous metal cutting
• Dual TiAlCr and TiSi coating improves heat resistance and extends tool life
• 135-degree split point reduces thrust force and improves self-centering on entry
• Tapered web configuration supports chip flow and reduces cutting resistance
• Straight-cylindrical shank fits standard drill chucks and collet toolholding
• h8 diameter tolerance ensures consistent fit within tight hole-tolerance requirements

Compatibility

Designed for cutting cast iron and steel workpieces (primary workpiece material codes K and P). Sized within the 8.00 to 9.00 mm (0.3000 to 0.3500 inch) drill bit range. Part of the SUMITOMO MDW-GS series. Coolant-through capability is not available on this model.

Installation Notes

This tool is intended for installation by machinists and toolroom technicians in a CNC or manual machining environment. Secure the shank fully in a compatible collet, drill chuck, or toolholder before operation, and verify runout is within acceptable limits for the application. Power down and lock out the machine spindle before changing or inspecting the bit. Solid carbide tooling is brittle and should not be subjected to side loads or impact beyond its rated cutting parameters.