Hertel 74131525 Screw Machine Drill Bit 19/64 in Cobalt

Product Description

The HERTEL 74131525 is a screw machine length drill bit designed for high-performance drilling in ferrous and hard materials. Built from cobalt steel and finished with a TiAlN coating, this bit handles elevated heat and abrasion better than standard HSS tooling. The 135-degree split point starts on contact without center-punching, reducing walking on flat or curved surfaces. At 2.75 inches overall length, the screw machine format keeps the tool close to the chuck for maximum rigidity in tight setups. It is suited for production machining, fabrication shops, and maintenance environments where cycle time and tool life matter.

This bit is used in drill presses, CNC machining centers, lathes with live tooling, and hand-held industrial drills where a short, stiff bit is preferred. The 19/64-inch diameter (0.2969 decimal inch) is a common size for clearance holes, tapping pilots, and close-tolerance bored features in steel, stainless, cast iron, and hard alloys. Right-hand cutting direction is standard for conventional drilling operations. A web-thinned parallel web configuration reduces thrust load and improves chip evacuation through the spiral flute.

Key Features

• Cobalt steel construction for heat resistance in hard and abrasive materials
• TiAlN coating extends tool life and reduces friction at the cutting edge
• 135-degree split point for self-centering entry without center punching
• Screw machine length (2.75 inches OAL) maximizes rigidity in chuck-close setups
• Web-thinned parallel web reduces thrust and improves chip flow
• Straight-cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as a standard screw machine length drill bit compatible with any drill press, machining center, or handheld drill using a straight-cylindrical shank chuck accepting up to 19/64-inch diameter tooling.

Installation Notes

This bit is installed and serviced by machinists, tool and die technicians, and industrial maintenance professionals. Secure the straight-cylindrical shank fully in the chuck and verify runout before cutting. No coolant-through capability is present on this bit, so apply cutting fluid externally when drilling deep holes or hard materials to manage heat buildup. Inspect the cutting edges and TiAlN coating for wear or chipping before each use and replace when edge geometry is compromised.