Hertel 74148800 Screw Machine Drill Bit 9/64 in Carbide

Product Description

The HERTEL 74148800 is a solid carbide screw machine length drill bit designed for high-precision drilling in demanding materials. With a 9/64 inch (0.1406 inch decimal) diameter and a 135-degree split point, it delivers fast entry and accurate hole placement with minimal walking. The web-thinned, parallel web construction reduces thrust and improves chip evacuation. The bright, uncoated finish is standard for solid carbide tooling intended for use in abrasive or corrosion-resistant workpiece materials. Overall length is 1-15/16 inches with a 15/16 inch flute length. Licensed machinists and tool-room technicians are the primary users of this bit.

This drill bit is suited for production and maintenance drilling in cast iron, nickel alloy, stainless steel, titanium alloy, and tool steel. The screw machine length format - shorter than jobber length - provides rigidity in CNC machining centers, drill presses, and turret lathes where stub-length tooling reduces deflection. The slow spiral flute geometry is specifically chosen for hard, tough, and stringy materials that would cause a standard helix to chatter or gall. Right-hand cut orientation is standard for conventional spindle rotation.

Key Features

• Solid carbide construction for hardness and wear resistance in difficult-to-machine alloys
• 135-degree split point reduces entry force and prevents bit walking on hard surfaces
• Web-thinned parallel web lowers axial thrust and improves chip flow
• Slow spiral flute geometry optimized for cast iron, stainless steel, titanium alloy, nickel alloy, and tool steel
• Screw machine (stub) length body provides increased rigidity over jobber-length bits
• Diameter tolerance of +0.0000 to -0.0005 inches ensures tight hole sizing

Compatibility

Designed as a general-purpose screw machine length drill bit for use in CNC machining centers, manual drill presses, and turret lathes accepting straight cylindrical shanks in the 0.1000 to 0.1500 inch diameter range.

Installation Notes

This bit is installed by machinists and tool-room technicians in standard drill chucks or collet systems accepting straight-cylindrical shanks. Ensure the spindle and workpiece are fully secured before operation and confirm spindle speed is appropriate for the workpiece material and bit diameter. Inspect the cutting edges for chipping before each use, as solid carbide is brittle and sensitive to impact or side loading. Do not use for hand drilling applications where lateral force cannot be controlled.