Osg HP255-1831 Solid Carbide Jobber Drill 4.65 Mm

Product Description

The OSG HP255-1831 is a solid carbide jobber-length drill bit designed for high-performance drilling in steel, alloy steel, and cast iron. It features a 4.65 mm diameter, a 140-degree R-thinned point for self-centering entry, and a WD1 coating that extends tool life in demanding ferrous-material applications. The straight-cylindrical shank measures 6.00 mm in diameter, and the overall length is 74.00 mm. Two spiral flutes with a regular helix evacuate chips efficiently during blind hole, cross hole, and through-hole operations. This drill is suited for CNC machining centers and manual drilling setups where precision and tool longevity are priorities.

The HP255-1831 is built for production drilling in ferrous workpieces including carbon steel, alloy steel, and cast iron. The 5xD flute-to-diameter ratio and coolant-through design make it well-matched to high-cycle applications where internal coolant delivery is available. Typical installations include machine shops, fabrication facilities, and maintenance environments where tight-tolerance hole sizing and consistent tool performance are required. The drill fits standard collets and chucks accepting a 6.00 mm straight-cylindrical shank.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous materials
• WD1 coating reduces friction and extends cutting life in steel and cast iron
• 140-degree R-thinned point provides self-centering entry and reduces thrust
• Coolant-through design supports internal coolant delivery for heat management
• Right-hand, regular-spiral, two-flute geometry for efficient chip evacuation
• Suitable for blind hole, cross hole, and self-centering drilling applications

Compatibility

Designed for use in steel, alloy steel, and cast iron workpieces. Compatible with standard tool holders and collet chucks accepting a 6.00 mm straight-cylindrical shank. Fits within the OSG HP255 series range covering 4.00 mm to 5.00 mm drill diameters.

Installation Notes

Installation and operation should be performed by a qualified machinist or tooling technician familiar with carbide drill handling. Secure the shank fully in the collet or chuck and verify runout before beginning a cut. Carbide drills are brittle — avoid side loading, interrupted cuts without proper feed adjustment, and re-chucking at an angle. When using the coolant-through feature, confirm coolant pressure and flow meet the machine tool specifications before starting the spindle.