Sumitomo U101076 Solid Carbide Drill Bit 0.257 in

Product Description

The SUMITOMO U101076 is a solid carbide screw machine length drill bit designed for high-performance drilling in demanding metalworking applications. It measures 0.257 inches in diameter (letter size F) and features a 135-degree split point for accurate self-starting without center-punching. The two-flute design and tapered web configuration promote chip evacuation, while the coated finish extends tool life. Coolant-through capability supports high-speed drilling in production environments. This bit is intended for use by machinists, tool and die tradespeople, and production drilling operations requiring consistent hole quality in hard or abrasive materials.

The U101076 is suited for drilling cast iron, stainless steel, and steel in both job shop and production settings. Its screw machine length profile keeps the bit rigid and reduces deflection, making it well matched to CNC machining centers, drill presses, and gang drilling fixtures. The MDW-HGS series is engineered for applications where tool life and hole accuracy in ferrous metals are the primary concerns.

Key Features

• Solid carbide construction for rigidity and extended tool life in ferrous and abrasive materials
• 135-degree drill point angle for accurate entry and reduced thrust force
• Coolant-through design supports high-speed and deep-hole drilling cycles
• Straight-cylindrical shank with h8 diameter tolerance for consistent chuck or collet fit
• Tapered web with 2 margins for improved hole roundness and finish
• Flute-by-diameter ratio of 3xD balances chip clearance with core strength

Compatibility

Designed as a replacement or standard MDW-HGS series drill bit for CNC machining centers and drill press applications requiring a 0.257-inch diameter solid carbide screw machine length bit suitable for cast iron, stainless steel, and steel workpieces.

Installation Notes

Installation and tool changes should be performed by qualified machinists with the spindle fully stopped and power isolated. Seat the straight-cylindrical shank fully in the collet or chuck to the specified grip depth before tightening. Verify coolant-through supply pressure and flow rate are set per machine specifications before beginning a drilling cycle. Inspect the drill point for chipping or wear before each use, as carbide tooling can fail suddenly if run with a damaged cutting edge.