Hertel 74131574 Screw Machine Drill Bit 3/8 in Cobalt Tialn

Product Description

The HERTEL 74131574 is a screw machine length drill bit engineered for high-performance drilling in tough materials. Built from cobalt steel with a TiAlN (titanium aluminum nitride) coating, it handles hardened steels, stainless, and abrasive alloys where standard high-speed steel bits wear out quickly. The 135-degree split point reduces walking on entry and lowers thrust force needed at the spindle. At 3.125 inches overall length, this stub-length design provides added rigidity compared to jobber-length bits, minimizing deflection in demanding machine tool applications. It is sold as a single bit per package.

This drill bit is suited for use in machining centers, drill presses, and manual machines where tight tolerances and shorter setups are required. The screw machine length format is a common choice in production environments where tool overhang must be minimized. Metalworking shops, maintenance machinists, and tool-and-die professionals are the primary users. It is appropriate for drilling operations in ferrous metals, stainless steel, titanium alloys, and similar hard materials where cobalt and TiAlN coating provide a measurable service life advantage over uncoated HSS tooling.

Key Features

• Cobalt steel construction with TiAlN coating for extended tool life in hard and abrasive metals
• 135-degree split point reduces thrust and eliminates the need for a center punch on flat surfaces
• Screw machine (stub) length at 3.125 inches OAL for increased rigidity and reduced deflection
• Regular spiral flute with web-thinned, parallel web configuration for efficient chip evacuation
• Straight cylindrical shank fits standard drill chucks and collet holders without modification
• Right-hand cutting direction; no coolant-through capability

Compatibility

Designed as a direct-fit replacement screw machine length drill bit for any machine tool or drill press accepting a straight cylindrical shank in the 0.3500 to 0.4000 decimal inch drill size range.

Installation Notes

Installation is performed by machinists and maintenance technicians using standard drill chucks or ER collet systems. Ensure the machine spindle is fully stopped and locked out before changing tooling. Seat the shank fully and evenly in the chuck or collet to prevent runout. Verify spindle speed and feed rate are appropriate for the workpiece material before starting the cut; excessive speed in hard alloys will degrade the coating prematurely.