Osg HP253-2559 Carbide Screw Machine Drill Bit 6.50mm

Product Description

The OSG HP253-2559 is a solid carbide screw machine length drill bit designed for high-performance drilling in steel, alloy steel, and cast iron. It features a 6.50 mm (0.2559 inch) diameter, a 140-degree split point, and a multi-layer coating for extended tool life. The stub-length body keeps the bit rigid and reduces deflection, making it well suited for close-tolerance work in production environments. Coolant-through capability supports chip evacuation at elevated feed rates. A licensed machinist or tool-and-die tech is the typical end user for this type of cutting tool.

This drill bit is built for short-hole drilling applications in metal fabrication, machining centers, and production shops. The screw machine length format is commonly used in CNC drilling operations and turret lathes where spindle clearance is limited. The 3xD flute-to-diameter ratio and R-thinned web reduce thrust and improve centering accuracy. It is appropriate for use in ferrous workpiece materials including carbon steel, alloy steel, and cast iron at high cutting speeds where tool rigidity is critical.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous materials
• 140-degree split point for reduced thrust and self-centering entry
• Multi-layer coating extends tool life in abrasive and interrupted-cut conditions
• Coolant-through design supports chip evacuation and heat management at depth
• R-thinned web with tapered web configuration reduces drilling torque
• Straight cylindrical shank fits standard drill chucks and collet holders

Compatibility

Designed as a screw machine length carbide drill bit for use in ferrous workpiece materials including steel, alloy steel, and cast iron. Part of the OSG HP253 series covering the 0.2500 to 0.3000 inch (6.50 to 8.00 mm) diameter range.

Installation Notes

Installation and use should be performed by a qualified machinist or CNC operator. Secure the straight cylindrical shank fully in a drill chuck or collet holder before operation, verifying runout is within machine tolerance. When using coolant-through capability, confirm that coolant pressure and flow rate are appropriate for the spindle setup. Do not exceed the recommended cutting parameters for the workpiece material and machine spindle rating.