Osg HP253-3071 Carbide Screw Machine Drill Bit 0.3071in

Product Description

The OSG HP253-3071 is a solid carbide screw machine length drill bit designed for high-performance drilling in ferrous materials. It carries a 0.3071 inch (7.80 mm) diameter with a 140-degree drill point angle and features a coated finish to extend tool life and reduce heat buildup. The stub-length body keeps the bit rigid and resistant to deflection, making it well suited for precision holes in production and job shop environments. Two spiral flutes evacuate chips efficiently, and the R-thinned web reduces thrust force at the cutting tip. Installation is handled by machinists and CNC operators working in metalworking applications.

This drill bit is intended for use in steel, alloy steel, and cast iron workpieces. The screw machine length format fits standard drill chucks and tool holders found on CNC machining centers, drill presses, and turret lathes. The straight-cylindrical shank with an 8.00 mm (0.315 inch) diameter seats securely in collet chucks and standard drill holders. The 3xD flute-to-diameter ratio and coolant-through capability make it appropriate for through-coolant spindles in high-volume production drilling where consistent hole quality is required.

Key Features

• Solid carbide construction provides rigidity and heat resistance for ferrous metal drilling
• 140-degree drill point angle optimized for steel, alloy steel, and cast iron
• Coolant-through design supports internal coolant delivery for chip evacuation and thermal control
• R-thinned web reduces cutting thrust and improves center cutting action
• Coated finish extends tool life and helps resist built-up edge
• Screw machine length body minimizes overhang and maximizes rigidity in tight setups

Compatibility

Designed for use in steel, alloy steel, and cast iron workpieces. Compatible with through-coolant spindles and standard straight-shank drill holders accepting an 8.00 mm shank diameter. Part of the OSG HP253 series.

Installation Notes

This tool is installed and operated by machinists and CNC technicians. Confirm spindle speed and feed rate are appropriate for the workpiece material and bit diameter before operation. Secure the straight-cylindrical shank firmly in a collet or drill chuck to the rated clamping torque of the holder being used. Inspect the cutting edges and coating condition before each use and replace the bit if chipping or excessive wear is observed.