Osg 630038911 Screw Machine Drill Bit 25/64 Solid Carbide

Product Description

The OSG 630038911 is a screw machine length solid carbide drill bit designed for high-performance drilling in demanding metalworking applications. It measures 25/64 inch (0.3906 inch decimal, 9.92 mm) in diameter with a 140-degree drill point angle and a coated finish for extended tool life. The bit features a right-hand cut, two-flute spiral configuration, and a straight-cylindrical shank. With an overall length of 89 mm and a flute length of 47 mm, this compact stub-length geometry delivers rigidity and accuracy in short-reach drilling setups. It is suited for machinists, tool and die technicians, and production drilling operations.

This drill bit is built for cutting steel, alloy steel, and cast iron. The screw machine length format makes it a practical choice for CNC machining centers, drill presses, and manual turret lathes where clearance is limited and hole placement accuracy is critical. The R-thinned web reduces thrust load at entry, improving center-starting performance in production runs. The 2xD flute-to-diameter ratio supports efficient chip evacuation in short-depth holes. No coolant-through capability is present, so external coolant or cutting fluid application is standard practice for this configuration.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard metal drilling
• 140-degree split-point geometry with R-thinned web reduces walking and thrust load
• Coated finish extends cutting edge life in steel and cast iron applications
• Screw machine (stub) length provides maximum rigidity in tight-clearance setups
• Straight-cylindrical shank fits standard drill chucks and collet holders
• Two-flute spiral design with tapered web promotes clean chip evacuation

Compatibility

Designed as a high-performance replacement drill bit for production and precision machining operations involving steel, alloy steel, and cast iron workpieces within the 0.3500 to 0.4000 inch diameter range, per OSG Series 6300 specifications.

Installation Notes

Installation is performed by machinists or tool setters in machine shop environments. Ensure the spindle is fully stopped and the machine is powered down before changing tooling. Secure the straight-cylindrical shank in a properly sized collet, drill chuck, or tool holder to the machine manufacturer's specified clamping torque range. Apply cutting fluid externally during operation when drilling steel or cast iron to manage heat and extend tool life.