Osg 15312505 Cobalt Jobber Drill Bit 5/16 Inches Tin

Product Description

The OSG 15312505 is a cobalt jobber-length drill bit with a titanium nitride (TiN) coating, designed for high-performance drilling in steel and alloy steel. It measures 5/16 inches (0.3125 inches decimal) in diameter with an overall length of 5 inches and a flute length of 3-3/16 inches. The 130-degree drill point angle with R-thinned web geometry reduces thrust and improves self-centering on entry. This bit is built for machinists, toolroom technicians, and maintenance professionals who need consistent results in ferrous materials without coolant-through capability.

This drill bit is suited for blind hole drilling, cross-hole operations, and general drilling applications in steel and alloy steel workpieces. The straight-cylindrical shank at 3/8 inches diameter fits standard drill chucks and is compatible with manual drill presses, CNC machining centers, and hand-held power drills used in industrial and fabrication environments. It is part of the OSG Series 1500, a line positioned for high-performance production and maintenance drilling tasks.

Key Features

• Cobalt construction provides heat resistance and edge retention in ferrous materials
• Titanium nitride (TiN) coating reduces friction and extends tool life
• 130-degree point angle with R-thinned web improves self-centering and reduces walking
• Regular spiral flute promotes efficient chip evacuation in through and blind holes
• Right-hand cut with 2 flutes for standard CW-rotating spindles
• Straight-cylindrical 3/8-inch shank fits most standard drill chucks

Compatibility

Designed for drilling steel and alloy steel workpieces; suitable for use in blind hole, cross-hole, and self-centering drilling applications. Fits any standard chuck accepting a 3/8-inch straight-cylindrical shank.

Installation Notes

Install in a properly sized drill chuck and verify shank seating before operation. Always power down or lock out the spindle before changing tooling, following OSHA lockout/tagout procedures. Use appropriate cutting fluid or cutting oil when drilling ferrous metals to extend tool life, even though this bit does not require coolant-through. Inspect the cutting edges for wear before each use and replace when point geometry is compromised to maintain hole-diameter tolerance.