Osg 10238005 Screw Machine Drill Bit 0.238in Cobalt Hss

Product Description

The OSG 10238005 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 superior heat and wear resistance compared to standard HSS tooling. It features a 130-degree drill point angle optimized for self-centering on harder workpiece materials, a regular spiral flute geometry, and a web-thinned point to reduce thrust and improve chip evacuation. At 3-3/16 inches overall length, the shortened screw machine profile provides added rigidity in drill press and CNC turret applications. This bit is sold individually and is intended for use by machinists and tool-and-die professionals.

The OSG 10238005 is suited for production drilling operations in steel and alloy steel workpieces. Its screw machine length — shorter than a jobber bit — makes it the preferred choice in turret lathes, CNC machining centers, and drill presses where rigidity and reduced deflection are critical. The 0.238-inch diameter corresponds to Letter B sizing, which is frequently called out in tapping and clearance hole charts for standard fastener applications in metal fabrication and manufacturing environments.

Key Features

• Cobalt high speed steel construction for elevated heat resistance in hard-material drilling
• 130-degree drill point angle for improved self-centering and reduced walking on steel surfaces
• R-thinned web reduces axial thrust and improves chip flow at the cutting edge
• Regular spiral flute with 1-3/8 inch flute length supports efficient chip evacuation
• Straight-cylindrical shank compatible with standard drill chucks and collet holders
• Screw machine length profile maximizes rigidity and minimizes deflection in short-reach setups

Compatibility

Designed as a screw machine length replacement drill bit for steel and alloy steel drilling operations in turret lathes, CNC machining centers, and drill press applications requiring a 0.238-inch (Letter B) diameter hole.

Installation Notes

This bit is installed by machinists and CNC operators into standard drill chucks or collet tool holders. Ensure the machine spindle is fully stopped and locked out before changing tooling. Verify chuck or collet size is rated for a straight-cylindrical shank at this diameter before seating the bit. Cutting fluid or coolant application is recommended when drilling steel or alloy steel to extend tool life, as this bit does not support through-coolant delivery.