Hertel 74130923 Cobalt Screw Machine Drill Bit Size 40

Product Description

The HERTEL 74130923 is a cobalt screw machine length drill bit designed for high-speed drilling in hard and abrasive materials. Built to Size 40 (0.0980 inches), it features a 135-degree split point that reduces walking on entry and lowers thrust requirements compared to conventional 118-degree points. The overall length is 1-13/16 inches with a 13/16-inch flute length, making it well suited for tight-clearance drilling operations on turret lathes, CNC machining centers, and screw machines. The straight cylindrical shank fits standard drill chucks without adapters. Right-hand cutting with a regular spiral flute pattern. Intended for use by machinists and tool-room technicians working with stainless steel, high-temperature alloys, and other hard ferrous metals.

This bit is sized for screw machine and short-hole drilling applications where a stub-length tool provides rigidity and reduced deflection. The cobalt construction handles work-hardening materials that would prematurely dull standard high-speed steel tooling. Typical install environments include production machine shops, maintenance shops, and contract manufacturing settings where wire-gauge drill sizes are routinely needed for tapping prep, clearance holes, and precision bore work in the 0.0000 to 0.1000 inch decimal range.

Key Features

• Cobalt construction for heat resistance in hard and work-hardening materials
• 135-degree split point reduces entry walking and cutting thrust
• Web-thinned parallel web for improved chip evacuation and reduced torque
• Screw machine (stub) length provides extra rigidity and reduced deflection
• Right-hand, regular spiral flute pattern for standard drilling applications
• Straight cylindrical shank fits standard drill chucks without additional tooling

Compatibility

Designed as an OEM-style screw machine length drill bit suitable for use in standard drill chucks, turret lathes, drill presses, and CNC machining centers accepting straight-shank tooling in the wire-gauge size range.

Installation Notes

Secure the shank fully in the chuck and verify concentricity before starting the cut. Use appropriate cutting fluid for cobalt tooling when drilling stainless or high-temperature alloys to extend tool life. Ensure the workpiece is firmly clamped before drilling to prevent movement that can chip the split point. Inspect the cutting edges for wear regularly; cobalt bits can be resharpened on a drill grinding fixture designed for split-point geometry.