Sumitomo U101058 Screw Machine Drill Bit 7/32 Solid Carbide

Product Description

The SUMITOMO U101058 is a solid carbide screw machine length drill bit designed for high-performance drilling in metalworking applications. At 7/32 inch (0.2188 inches) in diameter, it features a 135-degree split-point angle and a tapered web configuration that promotes self-centering and reduces walking on entry. The MDW-GS series construction uses solid carbide throughout for rigidity and wear resistance. With a straight-cylindrical shank and a compact 2.5591-inch overall length, this bit suits close-tolerance drilling operations where stub-length rigidity is required. It is typically installed by machinists and toolroom technicians in CNC machining centers, drill presses, and manual lathes.

This drill bit is suited for drilling cast iron and steel workpieces in production and maintenance machining environments. The screw machine length (stub) configuration minimizes deflection and improves hole location accuracy compared to jobber-length bits, making it a practical choice for repetitive drilling cycles on hard ferrous materials. The 2xD flute-by-diameter ratio supports chip evacuation in shallow-to-moderate depth holes. It does not include coolant-through capability, so external coolant or cutting fluid application is standard practice with this tool.

Key Features

• Solid carbide construction for rigidity and extended tool life in ferrous materials
• 135-degree drill point angle with tapered web for self-centering entry
• Straight-cylindrical shank with h8 diameter tolerance for consistent chuck fit
• Screw machine (stub) length at 2.5591 inches overall reduces deflection in tight setups
• 2-flute geometry with 1.0630-inch flute length optimized for chip clearance
• MDW-GS series coated finish for enhanced surface wear resistance

Compatibility

Designed as a screw machine length replacement drill bit for use in standard straight-shank drill chucks and collet holders accepting 7/32 inch diameter tooling; primary workpiece materials are cast iron and steel.

Installation Notes

Installation is performed by qualified machinists or toolroom personnel. Secure the straight-cylindrical shank fully in a drill chuck or collet to the recommended grip depth before operation. Confirm spindle speed and feed rate are appropriate for the workpiece material and bit diameter per machining reference data. Apply external cutting fluid or coolant at the cutting zone, as this bit does not support coolant-through delivery.