Hertel 74131418 Screw Machine Drill Bit 1/8 in Cobalt

Product Description

The HERTEL 74131418 is a screw machine length drill bit designed for high-productivity metal drilling in tight-clearance applications. Built from cobalt tool steel and coated with TiAlN, this bit handles harder workpiece materials and elevated cutting temperatures better than standard high-speed steel tooling. The 135-degree split point reduces thrust force and self-centers on contact, eliminating the need for a center punch on most materials. At 1.875 inches overall length, the stub-length geometry increases rigidity and reduces deflection compared to jobber-length bits. Right-hand cutting with a spiral flute, parallel web, and web-thinned geometry round out a configuration built for reliable chip evacuation and consistent hole quality in production environments.

This bit is suited for drilling steel, stainless steel, cast iron, and other ferrous and hard non-ferrous materials in machining, fabrication, and maintenance applications. The 0.125-inch diameter and screw machine length make it a practical choice for CNC machining centers, drill presses, and hand drilling in confined spaces where a standard jobber-length bit would flex or chatter. Straight-cylindrical shank seats directly into standard drill chucks without modification. It is sold and packaged individually.

Key Features

• Cobalt tool steel construction for heat resistance and extended tool life in hard materials
• TiAlN coating reduces friction and improves wear resistance at high cutting speeds
• 135-degree split point for reduced thrust and self-centering entry
• Web-thinned parallel web geometry promotes efficient chip evacuation
• Screw machine (stub) length increases rigidity and reduces deflection
• Straight-cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as a direct-fit replacement or upgrade for standard 1/8-inch diameter screw machine length drill bits used in drill presses, CNC machining centers, and hand drills equipped with a straight-shank chuck.

Installation Notes

This bit is installed by a machinist or maintenance technician using a standard keyed or keyless drill chuck. Ensure the machine is powered down and the spindle is fully stopped before changing tooling. Seat the shank fully and evenly in the chuck jaws before tightening to prevent runout. Use appropriate cutting fluid or dry cutting technique consistent with the workpiece material and machine setup.