Hertel 83240531 Cobalt Screw Machine Drill Bit 45/64 in

Product Description

The HERTEL 83240531 is a cobalt screw machine length drill bit designed for high-performance drilling in tough materials. Built to the HSCO135 series standard, it features a 45/64 inch (0.7031 inch decimal) diameter with a 135-degree split point geometry for fast, accurate starts without a center punch. The web-thinned construction reduces thrust and improves chip evacuation. At 4-3/4 inches overall length with a 3-inch flute, this stub-length bit offers rigidity in drill presses, lathes, and CNC setups. A right-hand spiral with regular flute form handles chip flow in both through-hole and blind-hole applications. The straw finish indicates heat treatment consistent with heavy-duty cobalt tooling.

This drill bit is engineered for machinists, tool-and-die workers, and maintenance technicians drilling stainless steel, tough alloys, and other work-hardening materials. Screw machine length bits are the standard choice where rigidity matters more than reach — common in production drilling, fixture work, and repair-shop applications. The straight cylindrical shank seats directly in drill chucks, collets, or keyless chucks without adapters. Two flutes keep the geometry simple and effective for general metal drilling at this diameter range.

Key Features

• 135-degree split point for self-centering entry and reduced thrust
• Web-thinned, parallel-web construction lowers feed force in hard metals
• Cobalt (HSS-Co) tool material handles stainless steel and tough alloys
• Screw machine (stub) length provides maximum rigidity over standard jobber bits
• Right-hand cut, regular spiral flute for reliable chip clearance
• Straight cylindrical shank fits standard drill chucks and collets without adapters

Compatibility

Designed as an OEM-style replacement or direct substitute for cobalt screw machine drill bits of 45/64 inch diameter in production and maintenance drilling applications on stainless steel and tough alloy workpieces.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with metal-cutting operations. Ensure the drill press, lathe, or CNC spindle is fully stopped and locked out before inserting or removing the bit from the chuck. Secure the straight shank firmly to the rated chuck capacity to prevent slippage under the torque loads typical of cobalt tooling at this diameter. Use appropriate cutting fluid or coolant rated for stainless steel when drilling work-hardening alloys to extend tool life and maintain hole quality.