Osg 11559915 Screw Machine Drill Bit 0.323 in Hss

Product Description

The OSG 11559915 is a screw machine length drill bit designed for high-performance metal cutting in production and shop environments. Turned from high speed steel with a coated finish, this bit features a 120-degree faceted drill point and a right-hand spiral flute configuration with web thinning for improved chip evacuation and reduced thrust. The straight-cylindrical shank measures 10 millimeters in diameter, allowing secure seating in standard drill chucks and CNC toolholders. At 0.323 inches (8.20 mm) in diameter, the bit targets letter-size P drilling applications and is built to OSG Series 1150 specifications for consistent performance across repeated use in production settings.

This drill bit is intended for use in screw machine operations, CNC machining centers, and benchtop drill press work where a compact, stubby geometry is preferred over jobber length. The shortened flute length reduces deflection in close-tolerance bores. The coated high speed steel construction handles steel, alloy steel, aluminum, aluminum alloy, and aluminum silicate workpiece materials without requiring through-coolant. It is typically installed by machinists, tool-and-die technicians, and maintenance mechanics running production drilling cycles.

Key Features

• 0.323 inch (8.20 mm) diameter with a tight tolerance of +0 to -0.022 mm for consistent hole sizing
• 120-degree faceted drill point with web thinning reduces entry thrust and improves centering
• Regular spiral flute geometry with tapered web configuration promotes chip clearing
• Screw machine (stub) length body limits deflection in short-reach drilling setups
• Coated high speed steel construction extends tool life across steel, alloy steel, and aluminum workpieces
• Straight-cylindrical shank fits standard chucks and collet toolholders without modification

Compatibility

Designed for use on steel, alloy steel, aluminum, aluminum alloy, and aluminum silicate workpieces. Fits any drill chuck or collet accepting a 10.00 mm straight-cylindrical shank. Part of OSG Series 1150.

Installation Notes

Installation and tool changes should be performed with the machine fully powered down and the spindle at a complete stop. Secure the straight-cylindrical shank in a properly sized collet or drill chuck to the full recommended grip depth before running. Inspect the cutting edges and coating for wear or chipping before each use, and replace the bit if the point geometry is compromised to avoid oversized or off-center holes. This tool does not require through-coolant, but flood or mist cooling is appropriate for extended production runs.