Osg 10246005 Screw Machine Drill Bit 0.246 in Cobalt Hss

Product Description

The OSG 10246005 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 in demanding production environments. It features a 130-degree split point angle with R-thinned web for improved centering and reduced thrust force on entry. The straight-cylindrical shank measures 0.246 inches in diameter and is compatible with standard drill chucks and holders. Machinists, tool and die workers, and maintenance mechanics rely on this bit for short, rigid setups where stub-length geometry reduces deflection and improves hole accuracy.

This drill bit is sized at 0.246 inches decimal inch, equivalent to letter size D and 6.25 mm, within the 0.2000 to 0.2500 inch diameter range of the OSG Series 1000 line. The screw machine length format makes it well suited for CNC machining centers, drill presses, and turret lathes where a shorter flute length and compact overall length improve rigidity. Primary workpiece materials are steel and alloy steel. The 3xD flute-to-diameter ratio supports chip evacuation in short-depth bores without coolant-through capability required.

Key Features

• Cobalt high speed steel construction for heat and wear resistance in ferrous materials
• 130-degree point angle with R-thinned web for self-centering and reduced thrust
• Screw machine length geometry provides rigidity and minimizes deflection in short setups
• 2-flute regular spiral design promotes chip clearance in steel and alloy steel
• Straight-cylindrical shank fits standard drill chucks without adapters
• Coated finish extends surface life compared to uncoated cobalt tooling

Compatibility

Designed as an OEM-style production drill for use in steel and alloy steel workpieces. Fits any drill chuck or collet holder accepting a 0.246 inch straight-cylindrical shank. Part of the OSG Series 1000 high performance screw machine drill line.

Installation Notes

This bit is intended for use by machinists and tool room professionals operating drill presses, lathes, or CNC machining centers. Secure the shank fully in the chuck before operation and verify runout before drilling to tight-tolerance holes. No coolant-through passages are present; apply cutting fluid externally when drilling steel at elevated speeds. Inspect the cutting edge for wear regularly, as cobalt tooling used beyond its service life can produce oversized or tapered holes.