Osg HP243-2520 Screw Machine Drill Bit 0.252in Carbide

Product Description

The OSG HP243-2520 is a solid carbide screw machine length drill bit designed for high-performance drilling in steel, alloy steel, and cast iron. With a 0.252-inch (6.40 mm) diameter and a 140-degree split point, this bit delivers accurate starts and clean through-holes in demanding ferrous materials. The R-thinned web reduces thrust load and improves chip evacuation. At 3.11 inches (79.00 mm) overall length with a 1.34-inch (34.00 mm) flute length, the screw machine format provides added rigidity over jobber-length bits, making it well suited to CNC machining centers, drill presses, and automatic screw machines running production work.

This bit fits typical production and job shop environments where short, rigid tooling is required to maintain hole tolerance in ferrous workpieces. The straight-cylindrical shank measures 8.00 mm (0.315 inches) in diameter and seats directly into standard drill chucks or collet holders. The 3xD flute-to-diameter ratio supports chip clearing in moderate-depth holes. Primary workpiece materials include steel, alloy steel, and cast iron. This bit is part of the OSG HP243 series, which targets high-performance drilling applications where tool life and dimensional accuracy are priorities.

Key Features

• Solid carbide construction for increased rigidity and wear resistance in ferrous materials
• 140-degree drill point angle for self-centering starts and reduced walking
• R-thinned web reduces axial thrust and improves chip flow
• Screw machine (stub) length provides greater rigidity than jobber-length equivalents
• 2-flute spiral design with regular helix for efficient chip evacuation
• Coated finish extends tool life in steel and alloy steel applications

Compatibility

Designed for drilling steel, alloy steel, and cast iron workpieces; compatible with standard drill chucks and collet holders accepting an 8.00 mm straight-cylindrical shank.

Installation Notes

Installation and tool changes should be performed with the machine fully powered down and locked out per applicable shop safety procedures. Ensure the shank is fully seated and the chuck or collet is tightened to the tool holder manufacturer's specification before running the spindle. Solid carbide tooling is brittle — avoid side loading or impact that could chip the cutting edges. Verify RPM and feed rate settings are appropriate for the workpiece material and hole depth before beginning a cut.