Osg HP253-1969 Screw Machine Drill Bit 0.1969 in Carbide

Product Description

The OSG HP253-1969 is a solid carbide screw machine length drill bit designed for high-performance drilling in steel, alloy steel, and cast iron. It has a 0.1969 inch (5.00 mm) diameter, a 140-degree drill point angle, and a right-hand spiral flute configuration. The bit features coolant-through capability, which helps manage heat and chip evacuation during demanding cutting operations. At 66.00 mm overall length with a 6.00 mm straight-cylindrical shank, this bit fits standard tool holders used in CNC machining centers and screw machine applications. It is intended for use by machinists and tool-room professionals working in production environments.

This drill bit is rated for primary workpiece materials including steel, alloy steel, and cast iron. The screw machine length format — shorter than jobber length — provides added rigidity and reduced deflection, making it well suited for close-tolerance hole placement in tight-clearance fixtures or short-setup machining operations. The HP253 series is built for a 3xD flute-to-diameter ratio, keeping chip loads manageable in interrupted or continuous cuts through ferrous materials.

Key Features

• Solid carbide construction for extended tool life in ferrous materials
• 140-degree drill point angle reduces thrust and improves entry accuracy
• Coolant-through design supports high-speed drilling with active chip and heat management
• R-thinned web with tapered web configuration minimizes chisel-edge walking at entry
• Right-hand cut, regular spiral flute for consistent chip evacuation
• Straight-cylindrical shank fits standard collets and drill chucks without adaptation

Compatibility

Designed for drilling steel, alloy steel, and cast iron workpieces. Fits tool holders and collets accepting a 6.00 mm straight-cylindrical shank. Applicable to CNC machining centers, screw machines, and similar production drilling equipment.

Installation Notes

Installation and use should be performed by qualified machinists familiar with carbide tooling. Ensure the spindle and workpiece are fully secured before engaging the cut. Confirm the coolant-through system is active and delivering adequate flow before running at elevated speeds to prevent thermal shock to the carbide substrate. Do not use this bit in hand-drill applications — it is intended for rigid machine setups only.