Osg 15257005 Cobalt Drill Bit Letter F 0.2570 in Tin

Product Description

The OSG 15257005 is a cobalt jobber-length drill bit sized to Letter F (0.2570 inch / 6.53 mm), designed for high-performance drilling in steel and alloy steel applications. The bit features a titanium nitride (TiN) coating that reduces friction and extends cutting life. A 130-degree split point promotes self-centering entry and reduces walking on flat or curved workpiece surfaces. With an overall length of 4-11/16 inches and a flute length of 2-7/8 inches, this bit fits standard jobber-length applications. The R-thinned web and tapered web configuration reduce thrust requirements and improve chip evacuation. This bit is suited for use by machinists, tool-and-die professionals, and maintenance technicians working with ferrous materials.

The OSG 15257005 is intended for drilling operations in steel and alloy steel workpieces. It is suited for blind hole drilling, cross hole drilling, through drilling, and self-centering applications. The 3/8-inch straight-cylindrical shank fits standard drill chucks on hand-held drills, drill presses, and CNC machining centers. The right-hand cutting direction is standard for conventional drilling setups. The Series 1500 designation identifies this as an OSG high-performance cobalt line targeting demanding ferrous material applications in production and maintenance environments.

Key Features

• Letter F size (0.2570 inch / 6.53 mm) with diameter tolerance of +0 to -0.022 mm
• Cobalt construction with titanium nitride (TiN) coating for extended tool life in ferrous materials
• 130-degree drill point angle with R-thinned, tapered web for self-centering and reduced thrust
• Regular spiral flute with right-hand cut promotes efficient chip evacuation
• 3/8-inch straight-cylindrical shank for compatibility with standard drill chucks
• Rated for blind hole, cross hole, through drilling, and self-centering tool applications

Compatibility

Designed for use in steel and alloy steel workpieces. Fits standard drill chucks and CNC tool holders accepting a 3/8-inch straight-cylindrical shank.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with drill press or CNC operation. Secure the workpiece firmly before drilling and confirm the chuck is properly tightened on the shank before starting the spindle. Coolant-through capability is not supported on this bit; use external cutting fluid when drilling deep holes or working with hard alloy steels to manage heat buildup. Inspect the cutting edges for wear before each use and replace the bit if chipping or dulling is observed.