Osg HP255-1563 Jobber Drill Bit 5/32 in Solid Carbide

Product Description

The OSG HP255-1563 is a jobber-length, solid carbide drill bit designed for high-performance drilling in ferrous materials. It features a 5/32-inch (3.97 mm) diameter, a 140-degree R-thinned point for accurate self-centering entry, and a WD1 coating for extended tool life in demanding applications. The straight-cylindrical shank measures 6.00 mm in diameter, and the overall length is 74.00 mm (approximately 2.91 inches) with a flute length of 36.00 mm (approximately 1.42 inches). Two spiral flutes in a regular helix geometry clear chips efficiently during right-hand cutting. This bit is built for trade professionals who need consistent, repeatable hole quality in production or field environments.

The HP255-1563 is suited for drilling blind holes, cross holes, and through holes in steel, alloy steel, and cast iron. Its 5xD flute-to-diameter ratio and coolant-through capability make it a practical choice for CNC machining centers, drill presses, and other setups where internal coolant delivery is available. The R-thinned point reduces thrust load at entry, which is especially useful when drilling into interrupted cuts or cross-hole configurations common in fabrication and mechanical contracting work.

Key Features

• Solid carbide construction for rigidity and heat resistance in ferrous materials
• WD1 coating extends tool life and reduces built-up edge on steel and cast iron
• 140-degree R-thinned point provides self-centering entry and reduced thrust
• Coolant-through design supports internal coolant delivery for deep-hole and high-feed applications
• Right-hand spiral flutes with regular helix for efficient chip evacuation
• Tapered web with R-thinned geometry minimizes chisel edge contact

Compatibility

Primary workpiece materials are steel, alloy steel, and cast iron (material codes P and K). Designed for tool applications including blind hole drilling, cross hole drilling, general drilling, and self-centering operations in the OSG HP255 series.

Installation Notes

Installation and use of carbide drill bits should be performed by qualified machinists or trade professionals familiar with cutting tool setup. Secure the shank fully in the drill chuck or collet before operation and verify runout is within acceptable limits for the application. Always power down and lock out the machine before changing tooling. Avoid side-loading carbide bits, as carbide is brittle and susceptible to fracture under lateral force.