Osg 8612404 Jobber Drill Bit No. 21 Wire Size 130 Deg Pm

Product Description

The OSG 8612404 is a jobber-length drill bit designed for high-performance drilling in ferrous and hard metals. Built from powdered metal (PM) construction with a V coating, this bit handles demanding applications where standard high-speed steel falls short. It carries a No. 21 wire gauge designation, equivalent to 0.1590 inch (4.04 mm) diameter, and features a 130-degree split-point tip with R-thinned web geometry to reduce thrust and improve self-centering at entry. The two-flute spiral design with a regular helix promotes chip evacuation in deep holes. Overall length is 87 mm with a 43 mm flute length, and the straight-cylindrical shank is 6.00 mm in diameter. Licensed machinists, tool-and-die techs, and maintenance professionals typically specify this Series 1950 bit for precision bore work.

This drill bit is rated for primary workpiece materials including steel, alloy steel, cast iron, and nickel alloy. Its tool application range covers blind holes, cross holes, general drilling, and self-centering entry cuts. The 130-degree point angle makes it well suited to harder alloys where a standard 118-degree point would deflect or wear prematurely. The V coating adds surface hardness and lubricity to extend tool life in production drilling environments. This is a single-piece unit, sold individually, and is appropriate for both manual drill press use and CNC operations in shop and field settings.

Key Features

• Powdered metal construction with V coating for extended wear life in ferrous alloys
• 130-degree point angle reduces thrust and suits harder workpiece materials including nickel alloys and cast iron
• R-thinned web with tapered web configuration improves self-centering and lowers entry force
• Two-flute regular spiral flute promotes consistent chip evacuation in blind and cross-hole applications
• Straight-cylindrical shank (6.00 mm) fits standard drill chucks and CNC toolholders
• Diameter tolerance held to +0 to -0.018 mm for precision bore sizing

Compatibility

Designed as an OEM-style jobber-length drill bit for use in drill presses, CNC machining centers, and hand-held power drills accepting a straight-cylindrical shank. Rated for workpiece materials coded P (steel), K (cast iron), S (nickel alloy), and H (hardened materials) per the supplier material classification system.

Installation Notes

This bit is installed by machinists and metalworking professionals using standard drill chucks or collet-style toolholders rated for the 6.00 mm shank diameter. Ensure the workpiece is securely fixtured and the machine is at a full stop before changing tooling. Use appropriate cutting fluid or coolant for steel and nickel alloy applications to manage heat, even though coolant-through is not available in this bit design. Inspect the cutting edge and web before each use and replace the bit when the point shows visible wear or chipping to avoid workpiece damage.