Sumitomo U101051 Screw Machine Drill Bit 13/64 in Carbide

Product Description

The SUMITOMO U101051 is a solid carbide screw machine length drill bit designed for high-performance drilling in steel and cast iron. With a 13/64 inch (0.2031 inch decimal) diameter and a 135-degree web-thinned point, it enters material cleanly and reduces thrust force at the start of the cut. The DEX multi-layer coating extends tool life in abrasive ferrous materials. The straight cylindrical shank measures 0.2344 inches in diameter, making it compatible with standard drill chucks and tool holders. At 2.5591 inches overall length, this stub-style bit fits tight-clearance applications where a jobber-length drill would not. It is sold individually and suited for production and maintenance machining environments.

This bit is engineered for drilling steel and cast iron in screw machine, CNC drilling, and general production setups. The MDW-GS series targets applications where hole quality, tool life, and chip evacuation in short-depth holes are priorities. The 2-flute regular spiral geometry handles a maximum drilling depth of 0.6795 inches (17.26 mm), consistent with a 2xD flute-to-diameter ratio. Machinists and toolroom technicians working with ferrous workpieces in production or repair environments will find this bit well-suited to close-tolerance hole requirements, as indicated by the h8 diameter tolerance on the cutting edge.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous materials
• 135-degree web-thinned point reduces entry thrust and improves self-centering
• DEX multi-layer proprietary coating extends tool life in steel and cast iron
• Screw machine (stub) length at 2.5591 inches OAL for use in tight-clearance setups
• h8 diameter tolerance ensures consistent hole sizing for precision applications
• Right-hand cutting, 2-flute regular spiral for efficient chip evacuation in short holes

Compatibility

Designed as an OEM-style replacement or production tooling option within the SUMITOMO MDW-GS series, sized for drill bit diameter range 0.2000 to 0.2500 inches. Compatible with standard straight-shank drill chucks and collet holders accepting a 0.2344-inch shank diameter. Primary workpiece materials are steel and cast iron.

Installation Notes

Installation and use should be performed by qualified machinists or toolroom technicians. Secure the straight shank firmly in a calibrated chuck or collet holder before operation and verify runout is within acceptable limits for the required hole tolerance. Do not exceed the rated maximum drilling depth of 0.6795 inches per pass without retracting to clear chips. Inspect the cutting edge for wear or chipping before each use, as solid carbide is brittle and should not be used in interrupted cuts or on hardened workpieces beyond its rated material range.