Hertel 74131640 Cobalt Screw Machine Drill Bit 31/64 in

Product Description

The HERTEL 74131640 is a cobalt screw machine length drill bit designed for high-speed, high-heat drilling applications in metal and hard alloy workpieces. The bit measures 31/64 inch (0.4844 inch decimal) in diameter with an overall length of 3-11/16 inches and a flute length of 2-3/16 inches. A 135-degree split point reduces walking and allows the bit to self-center without a pilot hole. The TiAlN coating improves heat resistance and extends tool life in demanding production environments. This bit is used by machinists, tool-and-die professionals, and maintenance technicians working in shop or field settings.

Screw machine length drill bits are shorter than jobber-length bits, providing greater rigidity and improved accuracy in drill press, turret lathe, CNC, and screw machine applications. The shorter flute length and straight-cylindrical shank allow secure chuck engagement. This bit is well suited for drilling steel, stainless steel, cast iron, and other hard materials where heat buildup typically degrades standard high-speed steel tooling. Web-thinned geometry with a parallel web configuration reduces cutting resistance at the point and improves chip evacuation during through-hole and blind-hole operations.

Key Features

• 31/64 inch diameter (0.4844 inch decimal) cobalt construction for elevated heat and wear resistance
• 135-degree split point for self-centering entry and reduced thrust force
• TiAlN coating extends tool life in high-temperature cutting conditions
• Screw machine length body (3-11/16 inch OAL) provides rigidity and reduced deflection
• Web-thinned, parallel web design improves chip flow and lowers cutting resistance
• Right-hand spiral flute with straight-cylindrical shank for standard chuck compatibility

Compatibility

Designed as a screw machine length replacement drill bit for use in standard three-jaw chucks, drill presses, CNC machining centers, turret lathes, and screw machines accepting a straight-cylindrical shank in the 0.4500 to 0.5000 inch diameter range.

Installation Notes

Installation and tool changes should be performed with the machine fully powered down and locked out per applicable safety procedures. Secure the straight-cylindrical shank firmly in a properly sized chuck or collet before operation. Inspect the cutting edges and coating for wear or chipping before each use, as damaged tooling can affect hole quality and create safety hazards. No coolant-through capability is present on this bit; apply cutting fluid externally when drilling ferrous materials to manage heat buildup.