Osg HP255-1693 Solid Carbide Jobber Drill Bit 4.3 Mm

Product Description

The OSG HP255-1693 is a solid carbide jobber-length drill bit engineered for high-performance drilling in ferrous materials. Ground to a 140-degree point angle with R-thinned web geometry, it self-centers on entry and reduces thrust in hard workpieces. The WD1 coating extends tool life in steel, alloy steel, and cast iron applications. At 74 mm overall length with a 36 mm flute length and a 5xD flute-to-diameter ratio, this bit delivers consistent chip evacuation in moderate-depth holes. The straight-cylindrical shank measures 6 mm in diameter for secure chuck engagement. Installation is handled by machinists and CNC operators in job shop and production environments.

The HP255-1693 is suited for drilling blind holes, cross holes, and through holes in steel, alloy steel, and cast iron. Its coolant-through capability supports higher feed rates and longer tool life when used in machining centers or CNC drills equipped with internal coolant delivery. The regular spiral and tapered web configuration make it a reliable choice for production runs and precision work where consistent hole quality is required.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard ferrous materials
• WD1 coating for extended tool life in steel and cast iron
• 140-degree point angle with R-thinned web for self-centering and reduced entry thrust
• Coolant-through design compatible with internal coolant CNC setups
• Straight-cylindrical 6 mm shank fits standard drill chucks and collet holders
• Rated for blind hole, cross hole, drilling, and self-centering applications

Compatibility

Designed for use in machining centers, CNC drill presses, and manual drill presses equipped with a 6 mm or compatible collet or chuck. Primary workpiece materials are steel, alloy steel, and cast iron (ISO material codes P and K).

Installation Notes

Install and remove this tool only with the machine powered off and spindle fully stopped. Secure the straight-cylindrical shank firmly in a collet, drill chuck, or tool holder rated for the shank diameter before starting the spindle. When using coolant-through capability, verify that the machine spindle and toolholder are compatible with internal coolant delivery before operation. Handling solid carbide tooling requires care to avoid chipping the cutting edges during setup and storage.