Osg HP255-2008 Solid Carbide Jobber Drill Bit 5.1mm

Product Description

The OSG HP255-2008 is a solid carbide jobber length drill bit designed for high-performance drilling in ferrous materials. Built on OSG's HP255 series platform, it features a 5.1 mm diameter, a 140-degree point angle with R-thinned web geometry, and a WD1 coating optimized for extended tool life in demanding applications. The straight-cylindrical shank measures 6 mm in diameter, and the overall length is 82 mm with a flute length of 44 mm. The two-flute, regular spiral design promotes efficient chip evacuation. This bit is suited for machinists, tool-and-die professionals, and production operators who require consistent, repeatable hole quality in hard materials.

The HP255-2008 is engineered for drilling steel, alloy steel, and cast iron in applications including blind hole drilling, cross hole drilling, through drilling, and self-centering operations. The coolant-through design supports internal coolant delivery, making it compatible with CNC machining centers and drilling stations equipped with coolant-through spindles. The 5xD flute-to-diameter ratio accommodates moderate depth drilling without excessive chip packing. This bit targets production environments where tool consistency and material compatibility with P and K workpiece material codes are priorities.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous materials
• WD1 coating for improved lubricity and extended tool life in steel and cast iron
• 140-degree point angle with R-thinned web for reduced thrust and improved self-centering
• Coolant-through design compatible with internal coolant delivery systems
• Regular spiral, two-flute geometry at 5xD ratio for efficient chip evacuation in moderate-depth holes
• Straight-cylindrical 6 mm shank for standard collet and chuck compatibility

Compatibility

Designed for use in CNC machining centers, drill presses, and multi-spindle drilling equipment with standard collets or chucks accepting a 6 mm straight shank. Rated for primary workpiece materials classified under ISO material codes P (steel, alloy steel) and K (cast iron).

Installation Notes

Installation and operation should be performed by qualified machinists or CNC operators familiar with carbide tooling. Secure the shank fully in the collet or chuck to the manufacturer-recommended engagement depth before operation. Carbide tooling is brittle — avoid side loading, interrupted cuts, or re-chucking a worn tool without inspection. When using the coolant-through feature, confirm coolant pressure and flow rate are appropriate for the spindle setup before running.