Osg 61549 Screw Machine Drill Bit 0.1929 in Hss

Product Description

The OSG 61549 is a screw machine length drill bit designed for high-performance metal drilling in production and maintenance environments. It features a 0.1929-inch (4.90 mm) diameter, a 120-degree faceted point angle, and a two-flute spiral geometry with web thinning for improved chip evacuation and reduced thrust. Built from high speed steel with a coated finish, this bit delivers consistent performance across a range of ferrous and non-ferrous workpiece materials. The straight-cylindrical shank and compact screw machine length make it well suited for drill presses, CNC machines, and turret lathes where rigidity and repeatability matter.

This drill bit is intended for use in metalworking applications including production drilling, fabrication, and machining operations. Primary workpiece materials include steel, stainless steel, aluminum, aluminum alloy, and aluminum silicate. The screw machine length profile reduces overhang and improves rigidity compared to jobber-length bits, making it a common choice for close-tolerance hole drilling in a shop or production floor setting. It is typically installed and used by machinists, tool-and-die professionals, and maintenance technicians working with standard drill presses or CNC equipment.

Key Features

• 0.1929-inch (4.90 mm) diameter with a tight tolerance of +0 to -0.018 mm
• 120-degree faceted point angle for accurate self-centering on metal surfaces
• Two-flute regular spiral geometry with web thinning for efficient chip removal
• Tapered web configuration reduces cutting force and heat buildup
• High speed steel construction with coated finish for extended tool life
• Straight-cylindrical shank sized at 6.00 mm for secure chuck retention
• Screw machine length with 5xD flute-to-diameter ratio for added rigidity

Compatibility

Designed for use in drilling steel, stainless steel, aluminum, aluminum alloy, and aluminum silicate workpieces. Part of the OSG Series 1100 high-performance screw machine drill line, compatible with standard drill chucks and holders accepting a 6.00 mm straight-cylindrical shank.

Installation Notes

This drill bit is installed in a compatible drill chuck or collet holder by a machinist or maintenance technician. Ensure the machine is fully powered down and locked out before changing tooling. Secure the shank completely within the chuck jaws to the recommended grip depth to prevent pullout under load. Follow the machine manufacturer and applicable ANSI or shop safety guidelines for spindle speed and feed rate selection based on workpiece material and hole diameter.