Osg 8595399 Screw Machine Drill Bit 0.157 in Hss

Product Description

The OSG 8595399 is a screw machine length drill bit designed for high-performance drilling in metalworking and light fabrication applications. Built from high speed steel with a coated finish, this bit features a 0.157 inch (wire size 22, 3.99 mm) diameter and a 130-degree faceted drill point for improved centering and reduced thrust. The web-thinned, tapered web design minimizes cutting resistance at entry. With a regular spiral flute and right-hand cut, the 8595399 is suited for machinists, toolmakers, and maintenance technicians requiring consistent, accurate hole production in demanding materials.

This drill bit is engineered for use on steel, stainless steel, aluminum, aluminum alloy, and aluminum silicate workpieces. Its screw machine length profile, shorter than jobber length, provides added rigidity and reduced deflection, making it well suited for drill press, CNC, and turret lathe applications. The straight-cylindrical shank fits standard drill chucks without adapters. The 5xD flute-to-diameter ratio supports chip evacuation in short-to-medium depth holes commonly encountered in production and repair work.

Key Features

• Wire size 22 (0.157 inches, 3.99 mm) diameter with tolerance of +0 to -0.018 mm
• 130-degree faceted point with web thinning for reduced entry force and improved centering
• High speed steel construction with coated finish for extended tool life
• Regular spiral, 2-flute design promotes efficient chip evacuation
• Screw machine length for increased rigidity and reduced deflection versus jobber bits
• Right-hand cut with straight-cylindrical shank for universal chuck compatibility

Compatibility

Designed as an OEM-style replacement or direct-use drill bit for applications requiring wire size 22 or 0.157 inch diameter holes in steel, stainless steel, aluminum, aluminum alloy, and aluminum silicate workpieces. Part of OSG Series 1100.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with rotary cutting tools. Secure the workpiece firmly before drilling and verify chuck grip on the straight-cylindrical shank before operation. Always wear appropriate eye protection and follow applicable machine guarding requirements. Inspect the cutting edges for wear or damage before each use and replace the bit if chipping or excessive wear is observed.