Osg 8595099 Screw Machine Drill Bit 0.039 in Hss

Product Description

The OSG 8595099 is a screw machine length drill bit designed for high-performance drilling in metal and non-ferrous materials. Built from high speed steel with a coated finish, it measures 0.039 inches (wire size 61, 0.99 mm) in diameter with a 150-degree faceted point angle and a web-thinned, tapered web configuration. The straight-cylindrical shank and regular spiral flute geometry promote clean chip evacuation and consistent cutting. At 38.00 mm overall length, this short-body design provides added rigidity compared to jobber-length bits, reducing deflection in precision drilling applications. Licensed machinists, tool-and-die technicians, and metal fabricators are the primary users.

This bit is suited for drilling steel, stainless steel, aluminum, aluminum alloy, and aluminum silicate in screw machine and close-tolerance production environments. The screw machine length format is commonly specified when rigidity and positional accuracy are required, such as when drilling from a turret, drill press, or CNC machining center without a pilot. The 5xD flute-to-diameter ratio supports deeper holes relative to bit diameter while maintaining chip clearance.

Key Features

• Wire size 61 (0.039 inches / 0.99 mm) diameter with tight tolerance of +0 to -0.014 mm
• 150-degree faceted point angle with web thinning for reduced thrust and improved centering
• High speed steel construction with coated finish for extended tool life in ferrous and non-ferrous materials
• Screw machine length body provides greater rigidity and reduced deflection versus jobber-length bits
• Right-hand cut, 2-flute regular spiral design for efficient chip evacuation
• Straight-cylindrical shank fits standard drill chucks and collet systems

Compatibility

Designed as an OEM-style replacement and production-use drill bit for screw machine, drill press, turret, and CNC applications requiring wire size 61 diameter in the OSG Series 1100 product line.

Installation Notes

Installation and use should be performed by qualified machinists or tool operators familiar with speeds-and-feeds selection for the target workpiece material. Secure the shank fully in the chuck or collet before operation and verify runout is within acceptable limits for the application. Do not exceed the recommended feed rate for the material being drilled, as this bit diameter is susceptible to breakage under excessive lateral load. Coolant-through is not supported on this bit; use external flood or mist coolant as appropriate.