Sumitomo U103723 Taper Length Drill Bit 11/32 in Carbide

Product Description

The SUMITOMO U103723 is a taper length twist drill bit from the MDW-HGS series, designed for high-performance drilling in demanding machining applications. Built from solid carbide with a DEX coating, it delivers extended tool life and wear resistance in abrasive or hard materials. The bit features an 11/32 inch (0.3438 inch decimal) diameter, a 135-degree split point for reduced thrust and accurate self-starting, and a J-Flute geometry that improves chip evacuation. Coolant-through capability makes it well suited for deep-hole work where heat and chip buildup are primary concerns. Machinists and toolroom professionals install this bit in CNC machining centers and drill presses requiring tight-tolerance, repeatable hole quality.

The U103723 targets metal-cutting operations in production machining, tool-and-die, aerospace component work, and precision fabrication shops. Its 8xD flute-length-to-diameter ratio and taper length configuration make it appropriate for applications requiring reach beyond standard jobber-length drills. The straight cylindrical shank fits standard ER collet chucks and precision drill chucks common in CNC and manual machining setups. Coolant-through channels support both internal and external coolant delivery systems, extending tool life and maintaining dimensional accuracy in steel, stainless, cast iron, and other difficult-to-machine alloys.

Key Features

• Solid carbide construction with DEX coating for extended wear resistance in hard and abrasive materials
• 135-degree point angle reduces entry thrust and promotes accurate hole starts without center-punching
• J-Flute geometry improves chip evacuation and reduces clogging in deep-hole drilling
• Coolant-through design supports internal coolant delivery for heat management in production runs
• 8xD flute-length-to-diameter ratio provides reach for deeper holes while maintaining rigidity
• Straight cylindrical shank fits standard collet and drill chuck toolholding systems

Compatibility

Designed as an OEM-style replacement or production drill for CNC machining centers, drill presses, and manual mills equipped with standard ER collet chucks or precision drill chucks accepting a 0.3594 inch straight cylindrical shank.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. The machine spindle must be brought to a full stop and all energy sources locked out before changing tooling. Confirm the collet or chuck bore matches the 0.3594 inch shank diameter and torque the toolholder to the machine manufacturer's specification. Verify coolant-through lines are clear and delivering flow before beginning any deep-hole drilling cycle.