Hertel 2386191 Screw Machine Drill Bit Size 12 Hss

Product Description

The HERTEL 2386191 is a screw machine length drill bit designed for high-volume, close-tolerance drilling in metal fabrication, machining, and general industrial applications. Built from high-speed steel with an oxide finish, this bit carries a wire size 12 designation and a decimal diameter of 0.1890 inches. The 135-degree split point reduces walking and cutting force at entry, making it well suited for production environments where accuracy and cycle time both matter. At 2.25 inches overall length, the shortened stub profile increases rigidity and reduces deflection compared to jobber-length bits. A licensed machinist or tool-and-die technician is the typical end user.

This bit fits standard drilling operations on steel, aluminum, cast iron, and similar materials in screw machine shops, production machining cells, and maintenance departments. The web-thinned, parallel-web configuration aids chip evacuation in deeper holes. The straight cylindrical shank seats directly into drill chucks, screw machine collets, and CNC tool holders with 0.1890-inch bore capacity. No coolant-through capability is present, so this bit is intended for conventional drilling with flood coolant or cutting oil applied externally if needed.

Key Features

• Wire size 12 with 0.1890-inch decimal diameter for precise hole sizing
• 135-degree split point reduces thrust force and eliminates center-punch requirement on flat stock
• High-speed steel construction provides heat resistance in production drilling cycles
• Oxide coating improves lubricity and corrosion resistance during storage and use
• Web-thinned parallel web promotes chip clearance and reduces heat buildup
• Screw machine length at 2.25 inches OAL maximizes rigidity and minimizes deflection

Compatibility

Designed as a standard screw machine length drill bit for use with drill chucks, collets, and CNC tool holders accepting a 0.1890-inch straight cylindrical shank across drill presses, turret lathes, and machining centers.

Installation Notes

Installation is performed by machinists and tool-room technicians following standard machine shop practices. Ensure the machine spindle is fully stopped and locked out before changing tooling. Seat the shank fully in the chuck or collet and confirm runout before beginning production drilling. Apply cutting fluid or flood coolant externally as appropriate for the workpiece material to extend tool life.