Osg HP255-2874 Solid Carbide Jobber Drill Bit 7.3 Mm

Product Description

The OSG HP255-2874 is a solid carbide jobber-length drill bit engineered for high-performance drilling in steel, alloy steel, and cast iron. It carries a 7.3 mm (0.2874 inch) diameter, a 140-degree drill point angle with R-thinned web, and a WD1 coating designed to extend tool life in demanding ferrous-material applications. The straight-cylindrical shank measures 8.00 mm and fits standard drill chucks. With a 5xD flute-to-diameter ratio and regular spiral flutes, this bit handles blind hole, cross hole, and self-centering operations. Coolant-through capability makes it well suited for deep-hole work where chip evacuation and heat control are critical. Licensed machinists and CNC operators are the primary users of this tooling.

The HP255-2874 is built for production and job-shop environments where consistent hole quality in ferrous materials is required. It performs in blind hole and cross hole applications on machining centers, drill presses, and CNC turning equipment. The R-thinned point promotes self-centering entry, reducing the need for a center-drill operation in many setups. Primary workpiece material codes P and K cover carbon steel, alloy steel, and cast iron, making this bit a practical choice across a wide range of industrial part families.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous materials
• WD1 coating extends tool life in steel and cast iron cutting applications
• 140-degree drill point angle with R-thinned web for self-centering entry
• Coolant-through design supports chip evacuation and thermal management in deep holes
• 5xD flute-to-diameter ratio accommodates deeper drilling passes without sacrificing chip clearance
• Straight-cylindrical shank fits standard collets and drill chucks

Compatibility

The HP255-2874 belongs to OSG Series HP255 and is sized for primary workpiece materials designated by material codes P and K, covering steel, alloy steel, and cast iron. It is compatible with machining centers, drill presses, and CNC equipment accepting an 8.00 mm straight-cylindrical shank.

Installation Notes

Installation and use of this tooling should be performed by qualified machinists or CNC operators familiar with carbide drill setup and speeds-and-feeds selection. Secure the shank fully in the chuck or collet before spindle engagement and confirm runout is within acceptable limits, as carbide tooling is sensitive to lateral loading. Always power down and lock out the spindle before changing tooling. Follow the machine manufacturer guidelines and applicable shop safety codes when operating at elevated speeds appropriate to carbide grades.