Hertel 74131624 Cobalt Drill Bit 29/64 Inch Tialn Split Point

Product Description

The HERTEL 74131624 is a cobalt screw machine length drill bit designed for high-performance drilling in hard and abrasive materials. Measuring 29/64 inches (0.4531 inches decimal) in diameter, it features a 135-degree split point that reduces walking and allows immediate cutting engagement without center punching. The TiAlN coating increases surface hardness and thermal resistance, extending tool life in ferrous metals, stainless steel, and high-temperature alloys. With an overall length of 3-9/16 inches and a flute length of 2-1/8 inches, this bit is engineered for stub-length rigidity. It is installed and operated by machinists and metalworking tradespeople using standard drill presses, CNC equipment, or hand-held power tools.

This drill bit is suited for production and job-shop drilling applications where tool longevity and hole accuracy matter. The screw machine length profile reduces deflection compared to jobber-length bits, making it a practical choice for drilling in tight clearances or fixture setups. Its right-hand spiral flute and web-thinned parallel web construction promote efficient chip evacuation in deep holes. Applications include drilling carbon steel, alloy steel, cast iron, and stainless steel in manufacturing, maintenance, and repair operations.

Key Features

• Cobalt tool material provides superior heat and wear resistance compared to standard high-speed steel
• TiAlN coating adds thermal barrier and extended cutting life on abrasive and hard metals
• 135-degree split point minimizes walking and reduces thrust force at entry
• Web-thinned parallel web design improves chip clearance and cutting efficiency
• Screw machine length (3-9/16 inches OAL) delivers added rigidity and reduced deflection
• Straight-cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as a screw machine length replacement drill bit for use in standard drill chucks and collet systems accepting a straight-cylindrical shank in the 0.4500 to 0.5000 inch diameter range.

Installation Notes

Installation and use should be performed by qualified machinists or metalworking tradespeople familiar with proper cutting speeds and feeds for cobalt tooling. Secure the shank fully in the chuck or collet and verify runout before drilling. Do not exceed the tool's rated RPM for the workpiece material. Coolant through is not supported on this bit; use external cutting fluid where required by the application.