Osg 15128505 Cobalt Jobber Drill Bit No. 30 Tin

Product Description

The OSG 15128505 is a cobalt jobber-length drill bit in No. 30 wire size (0.1285 inches / 3.26 mm diameter), designed for high-performance drilling in steel and alloy steel. The bit features a 130-degree split point with X-thinning for self-centering entry and reduced thrust on hard materials. A titanium nitride (TiN) coating extends surface hardness and tool life in production drilling applications. Overall length is 3-1/16 inches (77 mm) with a 1-5/8 inch (41 mm) flute length. This bit suits machinists, tool-and-die technicians, and metalworking tradespeople running production or maintenance drilling operations.

The OSG 15128505 is suited for drilling blind holes, cross holes, and through holes in steel and alloy steel workpieces. The straight cylindrical shank fits standard drill chucks and collet-style holders across benchtop drill presses, CNC machining centers, and handheld power drills. The regular spiral flute geometry promotes chip evacuation in ferrous materials. This size is commonly used in precision metalwork, fastener hole preparation, and light fabrication tasks requiring tight diameter tolerances.

Key Features

• Cobalt construction provides heat resistance for drilling steel and alloy steel
• TiN coating increases surface hardness and extends tool life in repetitive drilling
• 130-degree point angle with X-thinned web allows self-centering without a pilot hole
• Right-hand cut, regular spiral flute for efficient chip removal in ferrous materials
• Tapered web configuration adds rigidity and reduces deflection
• Diameter tolerance held to +0 to -0.018 mm for consistent hole sizing

Compatibility

Designed for use in standard drill chucks and collet holders accepting a 3/16-inch straight cylindrical shank. Primary workpiece materials are steel and alloy steel (material code P). Suitable for blind hole, cross hole, standard drilling, and self-centering applications.

Installation Notes

Installation and use should be performed by qualified machinists or metalworking tradespeople familiar with cutting tool safety. Secure the workpiece firmly before drilling and confirm the chuck or collet is properly tightened on the straight shank. Power down and de-energize the machine before changing or inspecting the bit. Do not exceed the recommended speed and feed range for cobalt-class tooling in the material being drilled; consult the OSG Series 1500 speed-and-feed chart for proper operating parameters.