Hertel 74131582 Screw Machine Drill Bit 25/64 in Cobalt

Product Description

The HERTEL 74131582 is a screw machine length drill bit designed for high-productivity drilling in metal fabrication, machining, and production environments. Built from cobalt high-speed steel and coated with TiAlN, it handles heat-intensive drilling in hard materials including stainless steel, alloy steel, and cast iron. The 135-degree split point starts on contact without walking, reducing the need for a center punch. At 3.25 inches overall length and 0.3906 inches in diameter (25/64 inches), the stubby geometry delivers rigidity and reduced deflection compared to jobber-length bits. Installed by machinists and maintenance mechanics in drill presses, CNC machines, and hand-held power tools.

This bit is suited for screw machine work, close-tolerance production drilling, and any application where a shorter, stiffer drill is preferred over jobber length. The right-hand spiral flute evacuates chips efficiently during through-hole and blind-hole operations in ferrous and non-ferrous metals. The straight cylindrical shank seats in standard drill chucks and collets across a wide range of machine tool setups. It is a solid choice for shops drilling in the 0.3500 to 0.4000 inch diameter range who need a coated cobalt bit for extended tool life.

Key Features

• Cobalt high-speed steel construction resists heat and wear in hard-metal drilling applications
• TiAlN coating extends tool life by reducing friction and heat buildup at the cutting edge
• 135-degree split point eliminates walking and reduces thrust required to start the hole
• Web-thinned parallel web configuration improves chip clearance and cutting efficiency
• Screw machine (stub) length provides extra rigidity and reduced deflection versus jobber bits
• Straight cylindrical shank fits standard drill chucks and collets without adapters

Compatibility

Designed as an OEM-style replacement or direct-use drill bit for production and maintenance drilling setups requiring a 25/64 inch diameter screw machine length bit with a straight cylindrical shank.

Installation Notes

Installed by machinists and maintenance mechanics using standard drill chucks or collets rated for straight shank tooling. Ensure the machine spindle is fully stopped and locked out before changing or inspecting the bit. Use cutting fluid appropriate for the workpiece material to maximize coating life and cutting performance. Follow applicable shop safety practices and machine tool manufacturer guidelines for spindle speeds and feed rates.