Osg HP255-1220 Solid Carbide Jobber Drill Bit 3.1mm

Product Description

The OSG HP255-1220 is a solid carbide jobber-length drill bit designed for high-performance drilling in ferrous metals. The bit measures 3.1 mm in diameter with a 140-degree R-thinned point that promotes self-centering and reduces thrust on entry. WD1 coating extends tool life in abrasive cutting conditions. Overall length is 66 mm with a 28 mm flute length and a 6 mm straight-cylindrical shank. Two spiral flutes with a regular helix evacuate chips efficiently. The 5xD flute-to-diameter ratio supports deeper hole applications without excessive deflection. Right-hand cut geometry suits standard drill press and CNC spindle setups.

This bit is built for drilling steel, alloy steel, and cast iron in production and maintenance environments. Typical applications include blind holes, cross holes, through drilling, and self-centering operations where point accuracy is critical. The tapered web configuration with R-thinning reduces the chisel edge load, making it well suited for tight-tolerance hole work in machining shops and industrial maintenance settings. The straight-cylindrical shank fits standard collets and chucks across common machine tool setups.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous materials
• 140-degree R-thinned point for self-centering entry and reduced thrust
• WD1 coating for extended tool life in steel and cast iron
• Coolant-through design supports internal coolant delivery for deep-hole and high-feed applications
• 5xD flute-to-diameter ratio accommodates deeper hole depths
• Tapered web with R-thinning reduces chisel edge load and walking tendency

Compatibility

Designed as an OEM-style replacement and standard production drill bit for use in steel, alloy steel, and cast iron workpieces; fits standard collets and chucks accepting a 6 mm straight-cylindrical shank.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with cutting tool setup. Secure the shank fully in the collet or chuck to the rated grip depth before operation. Verify spindle speed and feed rate are appropriate for carbide tooling in the workpiece material before beginning a cut. Inspect the cutting edges and coating condition before each use; do not run a chipped or cracked carbide bit.