Osg HP255-2520 Solid Carbide Jobber Drill Bit 6.4mm

Product Description

The OSG HP255-2520 is a solid carbide jobber-length drill bit designed for high-performance drilling in ferrous materials. Built on the HP255 series platform, it features a 6.4 mm diameter, a 140-degree point angle with R-thinned web geometry, and a WD1 coating that extends tool life in demanding applications. The straight-cylindrical shank measures 8.0 mm in diameter and seats securely in standard chucks and collets. Coolant-through capability supports chip evacuation and heat control during deep or interrupted cuts. This bit is suited for production drilling environments where consistency and tool life matter most.

The HP255-2520 is used in machining operations involving steel, alloy steel, and cast iron workpieces. It handles blind hole drilling, cross-hole drilling, and self-centering applications where R-thinned point geometry reduces walking without a center punch. With a 5xD flute-to-diameter ratio and an overall length of 91 mm, it fits standard CNC machining centers, drill presses, and manual machines where jobber-length tooling is appropriate. It is typically specified by machinists and tool-and-die professionals in job shops and production facilities working in the P and K material categories per ISO classification.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard ferrous materials
• WD1 coating reduces friction and extends tool life in steel and cast iron
• 140-degree R-thinned point for self-centering entry and reduced thrust force
• Coolant-through design supports chip evacuation in blind and deep holes
• Regular spiral flute with tapered web configuration for balanced cutting action
• Straight-cylindrical shank compatible with standard ER collets and drill chucks

Compatibility

Designed for drilling steel, alloy steel, and cast iron workpieces. Suitable for applications within the 6.00 mm to 7.00 mm drill bit size range. Compatible with setups requiring a straight-cylindrical shank and coolant-through capability. Verify spindle and collet clearance before use.

Installation Notes

Installation and use should be performed by qualified machinists familiar with carbide tooling. Ensure the machine spindle and workholding are clean and properly torqued before seating the shank. Carbide is brittle — avoid side-loading or using this bit as a reamer. Activate coolant flow before engaging the cut when using the coolant-through feature.