Hertel 74148792 Screw Machine Drill Bit 0.125 in Carbide

Product Description

The HERTEL 74148792 is a screw machine length drill bit designed for precision drilling in demanding materials. Ground from solid carbide to a C2 material grade, this bit features a 135-degree split point that reduces walking and allows drilling without a center punch. The slow spiral flute geometry controls chip evacuation and maintains edge integrity in tough workpieces. At 0.125 inches in diameter with a 1-7/8-inch overall length, it is sized for short-reach applications where rigidity and hole quality matter. Machinists and tool room technicians rely on this bit for accurate, consistent results in production and maintenance environments.

This drill bit is engineered for use in cast iron, nickel alloy, stainless steel, titanium alloy, and tool steel. The screw machine length format keeps overhang minimal, which is critical when drilling hard or stringy materials that generate high side loads. The straight-cylindrical shank mounts directly into standard drill chucks, collet holders, and CNC machine spindles. It suits applications in precision machining shops, tool rooms, and maintenance facilities where tight tolerances and material integrity are required. The parallel web configuration and web-thinned geometry reduce thrust force requirements at the spindle.

Key Features

• Solid carbide construction to C2 material grade for hardness and wear resistance in ferrous and exotic alloys
• 135-degree split point reduces entry thrust and eliminates the need for a center punch
• Slow spiral flute design controls chip flow in difficult-to-machine materials such as stainless steel and titanium alloy
• Web-thinned, parallel web configuration lowers axial cutting forces
• Bright uncoated finish suitable for applications where coating interaction with workpiece material is a concern
• Diameter tolerance held to +0.0000 to -0.0005 inches for close-tolerance hole requirements

Compatibility

Designed for use in standard drill chucks, collet holders, and CNC spindles that accept a straight-cylindrical shank. Intended for drilling cast iron, nickel alloy, stainless steel, titanium alloy, and tool steel workpieces.

Installation Notes

This bit is installed by machinists and tool room technicians in drilling machines, machining centers, and CNC equipment. Secure the straight-cylindrical shank fully in the chuck or collet before operation and verify runout before cutting. Solid carbide tooling is brittle and must not be subjected to side loading or interrupted cuts beyond the rated geometry. Always follow machine manufacturer guidelines for spindle speed and feed rate when drilling hard alloys.