Hertel 74130766 Cobalt Screw Machine Drill Bit Size 24

Product Description

The HERTEL 74130766 is a cobalt screw machine length drill bit designed for high-speed drilling in tough materials including alloy steels, stainless steel, and hardened workpieces. Built to wire gauge size 24, it delivers a decimal diameter of 0.1520 inches with a 135-degree split point for self-centering starts and reduced thrust. At 2-1/16 inches overall length, the stub-length design provides added rigidity and reduced deflection compared to jobber-length bits, making it well suited for tight-clearance drilling in metalworking and mechanical service environments. Licensed machinists, toolroom technicians, and trades-oriented fabricators are the primary users.

This bit is used in bench drill presses, CNC drilling operations, and hand-held electric drills wherever a short, stiff bit is required. The 1-inch flute length handles moderate chip evacuation in shallow-to-medium depth holes. The straw finish indicates heat treatment consistent with cobalt-grade tooling. Its straight cylindrical shank fits standard drill chucks without adapters, making it ready to run in most shop and field setups. Typical applications include drilling pilot holes in structural steel, sheet metal stacking, and mechanical component fabrication.

Key Features

• Cobalt construction for heat resistance and extended tool life in hard and abrasive materials
• 135-degree split point reduces walking and lowers required feed pressure at entry
• Web-thinned parallel web improves chip clearance and cutting efficiency
• Screw machine (stub) length adds rigidity and minimizes deflection on deep setups
• Right-hand spiral with regular flute geometry for standard clockwise drilling operations
• Straight cylindrical shank fits standard 3-jaw chucks without sleeves or adapters

Compatibility

Designed for use in any drill press, CNC machine, or hand-held drill chuck sized to accept a straight shank at 0.1520 inches decimal diameter, consistent with wire gauge size 24 tooling standards.

Installation Notes

Install and remove drill bits only with the machine fully de-energized and the chuck key removed from the chuck. Secure the workpiece in a vise or fixture before drilling - never hand-hold metal stock. Use appropriate cutting fluid or coolant for cobalt tooling when drilling steel to extend tool life and maintain dimensional accuracy. Inspect the split point for chipping or wear before each use; a damaged point will produce oversized or off-center holes.