Osg HP255-4646 Solid Carbide Jobber Drill Bit 11.8mm

Product Description

The OSG HP255-4646 is a solid carbide jobber-length drill bit engineered for high-performance drilling in ferrous materials. It carries an 11.8 mm (0.4646 inch) diameter and features a 140-degree drill point angle with R-thinned web geometry for reliable self-centering and reduced thrust. The WD1 coating improves wear resistance and heat management during aggressive cutting cycles. At 118 mm overall length with a 71 mm flute length, this bit fits standard jobber-length applications and accepts coolant-through delivery to extend tool life in deep or interrupted cuts. It is intended for installation in CNC machining centers, drill presses, and manual drilling equipment by machinists and tooling professionals.

The HP255-4646 is rated for use in steel, alloy steel, and cast iron (ISO material codes P and K). Its 5xD flute-to-diameter ratio and regular spiral geometry support chip evacuation in blind hole, cross hole, and through-hole drilling operations. The straight-cylindrical shank at 12 mm diameter seats securely in standard drill chucks and collet holders. This bit is suited to production machining environments where consistent hole quality and tool longevity in hard ferrous workpieces are required.

Key Features

• 140-degree drill point angle with R-thinned web for self-centering entry and reduced thrust load
• WD1 coating for enhanced wear resistance in steel and cast iron
• Coolant-through design supports extended tool life in blind and deep hole applications
• 5xD flute ratio promotes efficient chip evacuation in ferrous materials
• Straight-cylindrical 12 mm shank for compatibility with standard chucks and collet holders
• Right-hand cut, regular spiral flute geometry for consistent chip flow

Compatibility

Designed for use in steel, alloy steel, and cast iron workpieces per ISO material codes P and K. Suitable for blind hole, cross hole, and standard through-hole drilling operations in CNC and manual drilling setups within the OSG HP255 series range of 10.00 mm to 12.50 mm drill diameters.

Installation Notes

Installation and tool changes should be performed by qualified machinists with the spindle fully stopped and machine power locked out per facility lockout/tagout procedures. Verify chuck or collet runout before use, as excessive runout accelerates wear and reduces hole-diameter accuracy. Coolant-through setups should confirm pressure and flow rate match the machine spindle and tool holder specifications. Do not use this bit to enlarge existing holes unless the entry condition is appropriate for the point geometry.