Sumitomo 5UHY023 Screw Machine Drill Bit 4.20mm Carbide

Product Description

The SUMITOMO 5UHY023 is a screw machine length drill bit designed for high-performance drilling in steel and cast iron. Built from solid carbide with a multi-layer DEX coating, it delivers consistent cutting performance in demanding shop and production environments. The 135-degree web-thinned point reduces entry force and centers the bit reliably at the start of each hole. With an overall length of 2.4016 inches (61.00 mm) and a 4.20 mm diameter, this short-length bit is a practical choice for drilling in tight clearances or on rigid setups where rigidity and accuracy matter.

This drill bit is suited for CNC machining centers, drill presses, and automated production equipment where screw machine length tooling is specified. It is commonly used in metalworking shops, toolrooms, and industrial maintenance environments. Primary target materials include steel and cast iron. The straight cylindrical shank and h8 diameter tolerance support accurate, repeatable fitment in standard collets and chucks. The 2xD flute-to-diameter ratio and tapered web configuration support efficient chip evacuation at moderate cutting depths.

Key Features

• Solid carbide construction for wear resistance in steel and cast iron applications
• Multi-layer DEX proprietary coating for extended tool life and reduced friction
• 135-degree web-thinned point for reduced thrust and accurate hole entry
• Screw machine length for improved rigidity compared to jobber-length bits
• Straight cylindrical shank with h8 diameter tolerance for consistent chuck and collet fitment
• Coolant-free design suitable for standard drilling setups without through-coolant capability

Compatibility

Designed for use in standard straight-shank collets and chucks compatible with 5.00 mm shank diameter tooling. Suitable for machines accepting screw machine length drill bits in the 3.50 to 5.00 mm drill bit size range (0.1500 to 0.2000 decimal inch equivalent). Part of the SUMITOMO MDW-GS series.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Power down and de-energize the machine spindle before changing tooling. Confirm the collet or chuck bore matches the 5.00 mm shank diameter before tightening. Do not exceed the maximum drilling depth of 0.6575 inches (16.70 mm) for this tool length, as doing so may cause deflection or breakage.