Sumitomo U103727 3/8 Inch Solid Carbide Drill Bit Mdw-hgs

Product Description

The SUMITOMO U103727 is a jobber-length drill bit designed for high-performance metal cutting in demanding shop and production environments. Built from solid carbide and coated with a dual TiAlCr and TiSi finish, this bit delivers the hardness and thermal resistance required for cutting cast iron, stainless steel, carbon steel, and high-temperature alloys. The 135-degree split-point geometry reduces walking on entry and lowers thrust force compared to conventional 118-degree points. At 5.3543 inches overall length with a 3.1496-inch flute, it fits standard jobber-length drill chucks and is suited for CNC machining centers, drill presses, and manual machine tool operations. Coolant-through capability supports high-speed runs in production settings.

This drill bit is intended for metal cutting applications across a range of workpiece materials classified under ISO material codes K (cast iron), M (stainless steel), P (steel), and S (high-temperature alloys). The MDW-HGS series is engineered for use in CNC and manual drilling operations where tool life and hole quality in difficult materials are priorities. It is typically selected by machinists, toolroom technicians, and production floor operators working with ferrous and stainless workpieces. The straight-cylindrical shank and 0.3906-inch shank diameter seat securely in standard collet chucks and drill holders without modification.

Key Features

• Solid carbide construction provides rigidity and heat resistance for metal cutting applications
• Dual TiAlCr and TiSi coating extends tool life in high-friction ferrous and stainless materials
• 135-degree drill point angle reduces entry thrust and minimizes workpiece damage
• Coolant-through design supports internal coolant delivery for high-speed and deep-hole drilling
• Tapered web configuration improves chip evacuation and core strength
• MDW-HGS series, 5xD flute-to-diameter ratio, with h8 diameter tolerance for precision fitment

Compatibility

Designed for use with cast iron, stainless steel, steel, and high-temperature alloy workpieces. Fits standard straight-cylindrical collet chucks and drill holders accepting a 0.3906-inch shank diameter. Compatible with CNC machining centers and manual drill press setups equipped for coolant-through tooling.

Installation Notes

Installation and tool changes should be performed by qualified machinists or toolroom technicians with the machine in a fully stopped and locked-out state per applicable machine safety procedures. Ensure the collet or chuck is clean and free of debris before seating the shank to maintain concentricity and prevent runout. Verify that the machine spindle speed and feed rate are appropriate for the workpiece material and drill diameter before beginning the cut. Do not exceed the tool's rated operating parameters for coolant pressure or spindle RPM.