Osg HP253-3228 Screw Machine Drill Bit 0.3228 in Carbide

Product Description

The OSG HP253-3228 is a solid carbide screw machine length drill bit designed for high-performance drilling in steel, alloy steel, and cast iron. It measures 0.3228 inches (Letter P, 8.20 mm) in diameter with a 140-degree split point angle and a right-hand spiral flute configuration. The shortened screw machine length body provides greater rigidity compared to jobber-length bits, reducing deflection and improving hole accuracy in tough ferrous materials. This bit includes coolant-through capability, making it well suited for CNC machining centers and automated drilling operations where through-spindle coolant is available. It weighs 0.145 pounds.

This drill bit is built for production drilling applications in steel, alloy steel, and cast iron. The screw machine length format is a standard choice for turret lathes, CNC machining centers, and short-hole drilling fixtures where a stiffer tool is needed to maintain position and reduce runout. The straight-cylindrical shank seats in standard drill chucks and collets. The 3xD flute-to-diameter ratio supports chip evacuation in moderate-depth holes typical of production shop environments.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous materials
• 140-degree drill point angle reduces thrust and improves self-centering on entry
• Coolant-through design supports through-spindle coolant delivery for heat management and chip flushing
• R-thinned web with tapered web configuration reduces cutting resistance at the chisel edge
• Right-hand, regular spiral flute geometry promotes consistent chip evacuation
• Straight-cylindrical shank compatible with standard chucks and collets

Compatibility

Designed for drilling steel, alloy steel, and cast iron. Shank diameter is 10.00 mm (approximately 0.394 inches); confirm chuck or collet capacity before installation. Part of the OSG HP253 series, covering the 0.3000 to 0.3500 inch decimal inch size range.

Installation Notes

Installation is performed by machinists and tool-and-die professionals on CNC or manual machine tools. Ensure the machine spindle is fully stopped and the tool is properly torqued in the chuck or collet before operation. Verify coolant-through passages are clear and coolant pressure is set per machine specifications before initiating a drilling cycle. Do not run this bit in non-ferrous materials or stainless without confirming suitability with the manufacturer, as coating and geometry are optimized for the listed workpiece materials.