Osg 8690720 Carbide Screw Machine Drill Bit 0.2835in

Product Description

The OSG 8690720 is a solid carbide screw machine length drill bit designed for high-performance drilling in hard and demanding workpiece materials. Built on OSG Series 6500, this bit features a 140-degree drill point angle with R-thinned web geometry that reduces thrust and improves chip evacuation at the cutting tip. The 0.2835-inch (7.20 mm) diameter, two-flute spiral design provides efficient chip clearing in short-hole applications. Coolant-through capability supports consistent thermal management during production runs. This bit suits machinists, tool-and-die shops, and CNC operators who require tight dimensional control on ferrous and exotic metal workpieces.

The OSG 8690720 is suited for drilling in steel, alloy steel, cast iron, titanium, and titanium alloys. The screw machine length format — shorter than jobber length — increases rigidity and reduces deflection in turret lathes, screw machines, and machining center applications where stub-length rigidity is critical. The straight-cylindrical shank diameter of 8.00 mm fits standard drill chucks and collet holders. The 3xD flute-to-diameter ratio and tapered web configuration make this bit well-suited for production drilling environments where cycle time and hole quality are both priorities.

Key Features

• Solid carbide construction for superior hardness and wear resistance in ferrous and exotic materials
• 140-degree split point with R-thinned web reduces walking and cutting thrust
• Coolant-through design delivers coolant directly to the cutting edge for thermal control and extended tool life
• Regular spiral, two-flute geometry promotes efficient chip evacuation in short-hole drilling
• Screw machine (stub) length increases rigidity and minimizes deflection compared to jobber-length bits
• Coated finish enhances surface lubricity and abrasion resistance

Compatibility

Designed for drilling steel, alloy steel, cast iron, titanium, and titanium alloys. Fits standard chucks and collet systems accepting an 8.00 mm straight-cylindrical shank. Compatible with CNC machining centers, turret lathes, and screw machine setups requiring stub-length carbide drills in the 0.2500 to 0.3000 inch (6.50 to 8.00 mm) diameter range.

Installation Notes

Installation and use should be performed by qualified machinists or tooling technicians familiar with carbide cutting tools. Ensure the spindle and workpiece are fully secured before starting the cut. Verify that the machine coolant system is active and delivering flow through the tool before engaging the workpiece, as running coolant-through tooling dry can cause premature failure. Inspect the cutting edge for chipping or wear before each use, as solid carbide is brittle and sensitive to side loads or interrupted cuts.