Osg 10099505 Screw Machine Drill Bit 0.0995 in Cobalt

Product Description

The OSG 10099505 is a screw machine length drill bit designed for high-performance drilling in steel and alloy steel applications. Built from cobalt high speed steel with a coated finish, this bit delivers improved heat and wear resistance compared to standard HSS tooling. It features a 130-degree drill point angle, right-hand spiral flute with X-thinned web, and a straight-cylindrical shank for secure chuck holding. The screw machine length configuration provides added rigidity, making it well suited for CNC machining centers, drill presses, and production drilling setups. This bit is sold individually and intended for use by machinists, toolroom technicians, and trade professionals working with ferrous metals.

This bit is primarily used in production and job shop environments where close-tolerance hole-making in steel and alloy steel is required. The 0.0995 inch (wire gauge size 39) diameter and screw machine length make it a practical choice for short, rigid setups where standard length bits introduce deflection or chatter. It suits applications including tapping prep, clearance holes, and pilot drilling in both manual and CNC equipment. The 3xD flute-by-diameter ratio supports chip evacuation in moderate-depth holes without requiring peck cycles in most setups.

Key Features

• Cobalt high speed steel construction for improved heat resistance during high-speed drilling in steel and alloy steel
• 130-degree drill point angle for reduced thrust and self-centering entry on ferrous materials
• X-thinned web with tapered web configuration reduces cutting resistance and improves chip flow
• Screw machine (stub) length provides greater rigidity and reduced deflection compared to jobber length bits
• Right-hand spiral flute with regular helix promotes consistent chip evacuation
• Straight-cylindrical shank compatible with standard 3-jaw chucks and collet holders
• Drill bit diameter tolerance of plus 0 to minus 0.014 mm for close-tolerance hole sizing

Compatibility

Designed as an OEM-style screw machine drill bit for use in standard drill chucks and collet systems accepting straight-cylindrical shanks at the 0.0995 inch diameter range. Primary workpiece materials are steel and alloy steel per OSG Series 1000 design intent.

Installation Notes

Installation and use should be performed by qualified machinists or toolroom personnel familiar with cutting tool setup and machine operation. Secure the shank fully in the chuck or collet before operation and verify runout is within acceptable limits for the application. Always power down and de-energize the machine spindle before changing tooling. Follow applicable shop safety standards and machine manufacturer guidelines for speeds and feeds based on workpiece material and hole depth.