Osg 10089005 Screw Machine Drill Bit 0.089 in Cobalt Hss

Product Description

The OSG 10089005 is a screw machine length drill bit designed for high-performance drilling in steel and alloy steel. Built from cobalt high speed steel with a coated finish, it delivers extended tool life in demanding production environments. The bit features a 130-degree drill point angle with X-thinned web and a tapered web configuration, which reduces thrust and improves chip evacuation. At 0.089 inches (wire size 43) in diameter and 2 inches in overall length, this compact stub-length bit is suited for close-clearance and machine-tool applications. It is installed by machinists, tool and die professionals, and maintenance technicians using standard drill chucks or CNC toolholders.

This bit is intended for drilling operations in steel and alloy steel workpieces, including production drilling on screw machines, turret lathes, CNC mills, and drill presses. The screw machine length (stub length) profile reduces deflection and improves hole accuracy in short-depth applications. The 3xD flute-to-diameter ratio and regular spiral flute geometry make it a practical choice for high-cycle production environments where tool rigidity and repeatability matter. It is sold individually and is appropriate for professional shop and field maintenance use.

Key Features

• Cobalt high speed steel construction for improved heat and wear resistance over standard HSS
• 130-degree drill point angle with X-thinned web reduces entry thrust on tough steel workpieces
• Right-hand cut with regular spiral flute for standard chip evacuation
• Straight-cylindrical shank compatible with standard drill chucks and collet holders
• Screw machine (stub) length minimizes deflection in close-clearance and machine-tool setups
• Diameter tolerance of +0 to -0.014 mm for consistent hole sizing

Compatibility

Designed as an OEM-style replacement or direct-use drill bit for screw machines, CNC machining centers, turret lathes, and drill presses accepting a straight-cylindrical shank at 0.089 inches diameter.

Installation Notes

Installation is performed by machinists or maintenance technicians using a standard keyed or keyless drill chuck or collet system rated for the shank diameter. Ensure the machine spindle is fully stopped and locked out before changing tooling. Verify chuck or collet runout is within acceptable limits to preserve diameter tolerance. Cutting speed and feed rate should be set according to the workpiece material and the cobalt HSS grade recommendations for the specific machine being used.