Osg 8595317 Screw Machine Drill Bit 0.1248 in Hss

Product Description

The OSG 8595317 is a screw machine length drill bit designed for high-performance drilling in metal fabrication, machining, and shop environments. Built from high speed steel with a coated finish, this bit features a 130-degree faceted drill point, a web-thinned and tapered web configuration, and a two-flute regular spiral design that promotes efficient chip evacuation. The overall length is 1.97 inches (50.00 mm) with a straight-cylindrical shank diameter of 0.157 inches (4.00 mm) and a flute length of 0.71 inches (18.00 mm). Diameter tolerance is held to +0 to -0.0007 inches. It is sold individually and suited for machinists and tool-and-die professionals working with tight tolerances in production settings.

The OSG 8595317 is part of the Series 1100 screw machine length lineup, which is optimized for stub-length rigidity in drilling applications where standard-length bits introduce deflection or chatter. The shorter body improves concentricity and reduces runout in CNC machining centers, drill presses, and turret lathes. Primary workpiece materials include steel, stainless steel, aluminum, aluminum alloy, and aluminum silicate. The 5xD flute-to-diameter ratio supports consistent chip flow across these material groups at production feed rates.

Key Features

• 0.1248-inch (3.17 mm) drill diameter with +0 to -0.0007-inch tolerance for close-tolerance work
• 130-degree faceted drill point with web thinning for reduced thrust and improved centering
• Two-flute regular spiral design promotes chip evacuation in steel and aluminum
• High speed steel construction with coated finish for extended tool life
• Screw machine (stub) length body improves rigidity and reduces deflection
• Straight-cylindrical shank compatible with standard drill chucks and collets

Compatibility

Designed as a screw machine length replacement drill bit for production and precision machining applications involving steel, stainless steel, aluminum, aluminum alloy, and aluminum silicate workpieces. Part of OSG Series 1100.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or tool operators familiar with cutting tool setup and machine operation. Power down and de-energize the spindle before seating or removing the bit from the chuck or collet. Verify shank seating depth and runout before beginning a cut. Do not exceed the feed and speed parameters appropriate for the workpiece material and machine type.