Osg HP255-3189 Solid Carbide Drill Bit 8.1 Mm WD1

Product Description

The OSG HP255-3189 is a jobber-length, solid carbide drill bit engineered for high-performance drilling in steel, alloy steel, and cast iron. It carries a 140-degree point angle with an R-thinned web for improved self-centering and reduced thrust in hard materials. The WD1 coating extends tool life in demanding production environments. At 8.1 mm (0.3189 inch) diameter with a 103 mm overall length and a 61 mm flute length, this bit fits standard CNC machining centers and drill presses. It features a straight-cylindrical shank at 10 mm diameter and a two-flute spiral design. Coolant-through capability is built in, making it suitable for deep-hole work with minimal heat buildup.

This bit is rated for drilling in steel, alloy steel, and cast iron workpieces under ISO material codes P and K. Typical applications include blind holes, cross holes, standard through-hole drilling, and self-centering operations. The 5xD flute-to-diameter ratio and regular spiral geometry support consistent chip evacuation in short-run and production machining. It is sold individually and suited for shops running tight-tolerance work where diameter control matters — the bit holds a diameter tolerance of plus 0.006 to plus 0.021 mm.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous materials
• 140-degree point angle with R-thinned web reduces walking and entry burr
• WD1 coating extends tool life on steel and cast iron
• Coolant-through design supports chip flushing in blind and deep holes
• Straight-cylindrical 10 mm shank fits standard collet and drill chuck systems
• Tight diameter tolerance of plus 0.006 to plus 0.021 mm for precision bore applications

Compatibility

Designed for use in CNC machining centers, drill presses, and similar setups holding a 10 mm straight-cylindrical shank. Primary workpiece materials are steel, alloy steel, and cast iron (ISO material codes P and K).

Installation Notes

This bit should be installed by a qualified machinist or tooling technician. Ensure the spindle and collet or chuck are fully de-energized and locked out before changing tooling. Verify shank seating and runout before cutting, as carbide tooling is sensitive to lateral load. Do not use this bit on materials outside its rated workpiece categories, as carbide geometry and coating selection are material-specific.