Osg HP255-3740 Solid Carbide Jobber Drill 9.50 Mm

Product Description

The OSG HP255-3740 is a solid carbide jobber-length drill bit designed for high-performance hole-making in ferrous materials. It features a 9.50 mm diameter, a 140-degree R-thinned point for improved self-centering and reduced thrust, and a WD1 coating that extends tool life in demanding applications. The straight-cylindrical shank measures 10.00 mm in diameter, and the overall length is 103.00 mm with a 61.00 mm flute length. A regular spiral with two flutes provides efficient chip evacuation. Coolant-through capability supports deep-hole and interrupted-cut work. This drill is suited for machinists, toolroom technicians, and CNC operators running production or maintenance work on steel and cast iron components.

The HP255-3740 is engineered for use in steel, alloy steel, and cast iron workpieces, covering ISO material codes P and K. Application coverage includes blind holes, cross holes, standard drilling, and self-centering entry without a spot drill in many setups. The 5xD flute-to-diameter ratio supports moderate-depth bores in a single pass. It fits standard drill chucks and collet holders that accept a 10.00 mm straight shank, making it compatible with CNC machining centers, drill presses, and manual lathes commonly found in job shops and manufacturing facilities.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard ferrous materials
• WD1 coating reduces friction and extends edge life in steel and cast iron
• 140-degree R-thinned point promotes self-centering and lowers axial cutting force
• Coolant-through design supports chip flushing in blind and cross-hole applications
• Tapered web configuration with R-thinning maintains core strength while reducing walk
• Diameter tolerance of +0.006 to +0.021 mm delivers consistent hole sizing

Compatibility

Designed for use in steel, alloy steel, and cast iron workpieces (ISO material codes P and K). Accepts standard collet chucks and drill chucks with a 10.00 mm bore. Part of the OSG HP255 series covering the 9.00 mm to 10.00 mm diameter range.

Installation Notes

Install in a collet or drill chuck rated for the 10.00 mm shank diameter and confirm runout before cutting. Power down and lock out the spindle before changing tooling. When running coolant-through, verify that the machine tool's coolant supply pressure is within the range recommended for the holder and spindle in use. Solid carbide drills are brittle — avoid interrupted side loads and do not use them to ream or enlarge existing holes.