Osg 10205505 Screw Machine Drill Bit 0.2055 in Cobalt

Product Description

The OSG 10205505 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 extended tool life under demanding conditions. It features a 130-degree drill point angle with R-thinned web, a standard point type, and a regular spiral flute configuration. The straight-cylindrical shank seats securely in standard drill chucks. At 0.2055 inches in diameter (Wire Size 5), it fits tight-tolerance applications where dimensional accuracy matters. Machinists and maintenance technicians working in metalworking shops, job sites, and production environments rely on this bit for consistent, repeatable performance in short-hole drilling operations.

This bit is suited for drilling steel and alloy steel in screw machine, turret lathe, and CNC drilling setups where a shorter flute-to-diameter ratio improves rigidity. The 3xD flute-by-diameter ratio limits deflection and supports accurate hole positioning. With a right-hand cut and tapered web configuration, it clears chips effectively without requiring coolant-through capability. It is a strong fit for production drilling where tool changeover speed and hole quality are priorities.

Key Features

• Cobalt high speed steel construction with coated finish for extended wear resistance in ferrous materials
• 130-degree drill point angle with R-thinned web reduces entry force and improves centering
• Screw machine length (3xD flute ratio) provides added rigidity over jobber-length bits
• Right-hand cut with regular spiral flute for efficient chip evacuation
• Straight-cylindrical shank compatible with standard drill chucks and collets
• Diameter tolerance of plus 0 to minus 0.018 mm for consistent hole sizing

Compatibility

Designed as a screw machine length drill bit for use in steel and alloy steel workpieces; suitable for use in standard drill chucks, collets, and turret setups that accept a straight-cylindrical shank at this diameter range.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with drill press, lathe, or CNC equipment. Secure the shank fully in the chuck or collet and confirm runout is within acceptable limits before drilling. Power down and de-energize the machine before changing tooling. Follow the machine manufacturer and OSG recommendations for feed rate and spindle speed appropriate to the workpiece material and hole depth.