Osg HP255-3425 Solid Carbide Jobber Drill Bit 8.7mm

Product Description

The OSG HP255-3425 is a solid carbide jobber-length drill bit engineered for high-performance drilling in steel, alloy steel, and cast iron. Measuring 8.7 mm in diameter with a 140-degree point angle and R-thinned web geometry, it promotes self-centering entry and reduces thrust on hard materials. The WD1 coating improves wear resistance and heat dissipation during extended production runs. At 103 mm overall length with a 61 mm flute length, this bit fits standard jobber-length toolholders. Coolant-through capability supports high-speed drilling where chip evacuation and thermal control are critical. It is installed by machinists and toolroom technicians in CNC and manual drilling applications.

This drill bit is designed for blind hole drilling, cross-hole operations, and general through-hole drilling in ferrous workpiece materials. The 5xD flute-to-diameter ratio suits medium-depth hole applications common in production machining, fabrication shops, and maintenance environments. The straight-cylindrical shank at 10 mm diameter seats securely in standard drill chucks and collet holders. The regular spiral flute geometry with tapered web configuration promotes consistent chip flow in steel and cast iron without requiring specialized toolholding.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous materials
• WD1 coating enhances surface hardness and reduces built-up edge in steel and alloy steel
• 140-degree point angle with R-thinned web for self-centering and reduced entry thrust
• Coolant-through design supports high-speed drilling and deep-hole chip evacuation
• 5xD flute length ratio suitable for medium-depth blind and through holes
• Straight-cylindrical 10 mm shank compatible with standard chucks and collets

Compatibility

Designed for use in steel, alloy steel, and cast iron workpieces. Primary material codes P and K. Compatible with standard straight-shank drill chucks and collet toolholding systems accepting a 10 mm shank diameter. Suits CNC machining centers and manual drill presses configured for jobber-length tooling.

Installation Notes

Installation and tool changes should be performed with the machine powered down and locked out per applicable shop safety procedures. Confirm the toolholder bore is clean and free of chips before seating the shank to maintain concentricity. Coolant lines should be connected and verified before initiating a drilling cycle when using the coolant-through feature. Inspect the cutting edge for chipping or wear before each use, as carbide tooling can fracture if run in a damaged condition.