Hertel 74130402 29/64 in Cobalt Screw Machine Drill Bit

Product Description

The HERTEL 74130402 is a screw machine length drill bit designed for high-productivity drilling in metal and hard materials. Built from cobalt high-speed steel (HSCO), it handles elevated cutting temperatures better than standard HSS bits, making it well-suited for stainless steel, cast iron, titanium, and other tough alloys. The 135-degree split point geometry starts on contact without a center punch, reducing walking and improving hole location accuracy. At 3.5625 inches overall length, the shortened flute design provides greater rigidity and reduces deflection in production drilling applications. Web thinning lowers thrust requirements and improves chip evacuation.

This bit is used in screw machine work, CNC machining centers, drill presses, and hand-held drilling operations where hole accuracy and tool life under heat are priorities. The straight cylindrical shank accommodates standard drill chucks and collet holders across common machine platforms. It is a standard choice in metalworking shops, maintenance and repair operations, and industrial fabrication environments where stainless, alloy steel, or hardened materials are regularly drilled.

Key Features

• Cobalt (HSCO) construction for extended tool life in hard and abrasive metals
• 135-degree split point starts on contact, no center punch required
• Web-thinned parallel web reduces cutting thrust and improves chip flow
• Screw machine length body provides rigidity and reduces deflection
• Right-hand regular spiral flute for standard drilling applications
• Straight cylindrical shank fits standard drill chucks and collet systems

Compatibility

Designed as an OEM-style replacement or direct-use screw machine drill bit for metalworking applications requiring a 29/64 inch diameter hole in the 0.4500 to 0.5000 inch decimal size range.

Installation Notes

Installation is performed by machinists or maintenance technicians familiar with metal cutting operations. Secure the shank fully in the drill chuck or collet before operating, and verify runout before production drilling. Use appropriate cutting fluid or coolant for the workpiece material to extend tool life, noting this bit does not support coolant-through delivery. Follow applicable shop safety practices including guarding and eye protection when operating drilling equipment.