Osg HP255-2913 Carbide Jobber Drill Bit 7.4mm

Product Description

The OSG HP255-2913 is a solid carbide jobber-length drill bit designed for high-performance drilling in ferrous materials. It carries a 7.4 mm diameter, a 140-degree point angle with R-thinned geometry for self-centering entry, and an overall length of 91 mm with a 53 mm flute length. The WD1 coating extends tool life in demanding applications involving steel, alloy steel, and cast iron. The straight-cylindrical shank measures 8.0 mm in diameter and seats securely in standard drill chucks or toolholders. This bit is intended for use by machinists and tool-and-die professionals working with CNC machining centers, drill presses, and manual lathes.

This drill bit is suited for production and maintenance drilling operations on steel, alloy steel, and cast iron workpieces. Typical applications include blind hole drilling, cross-hole drilling, and through-hole drilling in close-tolerance environments. The 5xD flute-by-diameter ratio supports chip evacuation in moderate-depth holes. The R-thinned point reduces thrust force and aids in self-centering without a center punch on rigid setups. Coolant-through capability supports high-speed machining with internal coolant delivery for improved chip clearing and heat management.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous materials
• WD1 coating for extended tool life in steel and cast iron
• 140-degree R-thinned point for self-centering entry and reduced thrust
• Coolant-through design supports internal coolant delivery
• Straight-cylindrical 8.0 mm shank fits standard toolholders and drill chucks
• Regular spiral flute with tapered web for stable chip evacuation

Compatibility

Designed for drilling steel, alloy steel, and cast iron workpieces; compatible with workpiece material codes P and K per ISO classification. Fits standard straight-shank drill chucks and ER-style collet holders accepting an 8.0 mm shank.

Installation Notes

Installation and use should be performed by qualified machinists familiar with rotating cutting tool safety. Ensure the machine spindle is fully stopped and the tool is securely clamped in the holder before beginning setup. Verify spindle speed and feed rate against the material and coating manufacturer recommendations before cutting. Coolant-through tools require a compatible spindle coolant supply to realize full performance benefit.