Hertel 83240523 Cobalt Screw Machine Drill Bit 43/64 in

Product Description

The HERTEL 83240523 is a cobalt screw machine length drill bit engineered for cutting hard and abrasive metals in production and maintenance environments. Built to HSCO135 series standards, it features a 135-degree split point that reduces walking and lowers thrust requirements at the start of the cut. The 43/64-inch diameter (0.6719 inches decimal) pairs with a 4-5/8-inch overall length, keeping the tool compact and rigid for short-hole drilling on drill presses, lathes, and CNC machines. The web-thinned construction eases penetration into tough stock while the cobalt steel composition handles elevated heat generated when working hardened and stainless materials. Sold individually.

This bit is designed primarily for drilling stainless steel and tough alloys where high-speed steel tooling loses its edge prematurely. The screw machine length format suits applications where rigidity matters more than reach, including production drilling in shops, fabrication facilities, and field maintenance on heavy equipment. The straight cylindrical shank, sized at 0.6719 inches, fits standard drill chucks and collets without additional adapters. Two regular spiral flutes evacuate chips efficiently during through-hole and blind-hole operations. This bit is typically purchased by machinists, millwrights, and maintenance technicians working with difficult-to-machine alloys.

Key Features

• 43/64-inch (0.6719 inches) diameter cobalt construction for heat and wear resistance in tough alloys
• 135-degree split point reduces bit walking and cutting thrust on hard materials
• Web-thinned parallel web geometry lowers feed force and improves chip flow
• Screw machine length at 4-5/8 inches OAL delivers extra rigidity versus jobber-length bits
• Two regular spiral flutes with right-hand cutting direction for standard drill press and CNC use
• Straw finish indicates cobalt steel heat treatment — no additional coating applied

Compatibility

Designed as an OEM-style replacement or direct-purchase cutting tool for use in standard drill chucks and collets accepting a 0.6719-inch straight cylindrical shank. Primary workpiece materials are stainless steel and tough alloys per HSCO135 series design intent.

Installation Notes

Secure the shank fully in the chuck or collet before beginning any drilling operation and verify runout is within acceptable limits to avoid premature edge wear. Use cutting fluid or coolant rated for stainless and cobalt tooling to extend tool life; this bit does not have internal coolant-through capability. Set spindle speed according to the workpiece material and hole diameter — cobalt bits tolerate higher surface footage than HSS but still require appropriate feeds and speeds for the alloy being drilled. Inspect the split point for chipping after use on hardened material before returning the bit to service.