Hertel 74131111 Cobalt Screw Machine Drill Bit Size 59

Product Description

The HERTEL 74131111 is a cobalt screw machine length drill bit designed for drilling in tough materials where standard high-speed steel bits fall short. Built to series HSCO135, it features a 135-degree split point that reduces walking and allows faster penetration with less feed pressure. The bit measures 1-3/8 inches overall length with a 1/2-inch flute length, a straight cylindrical shank, and a straw finish consistent with cobalt tooling. The right-hand, regular spiral flute geometry promotes efficient chip evacuation. It is suited for machinists, tool-and-die technicians, and metalworking professionals who require precise, repeatable holes in hardened or abrasive stock.

This drill bit is intended for screw machine and short-hole drilling applications in metals including stainless steel, high-strength alloys, and cast iron. Its compact screw machine length provides added rigidity compared to jobber-length bits, making it a preferred choice when drilling in close-tolerance setups, drill presses, CNC machining centers, or turret-style screw machines. The wire gauge size 59 corresponds to a decimal diameter of 0.0410 inches, placing it in the small-diameter range commonly used for tapping prep, pin holes, and precision assembly work.

Key Features

• Cobalt construction provides heat resistance and hardness retention when drilling abrasive or work-hardening materials
• 135-degree split point reduces drill walking and lowers required feed force at entry
• Web-thinned, parallel web configuration improves chip flow and reduces torque load
• Screw machine length (1-3/8 inches OAL) adds rigidity over jobber-length alternatives
• Straight cylindrical shank fits standard drill chucks without adapters
• Right-hand, regular spiral flute for conventional drilling operations

Compatibility

Designed as an OEM-style replacement or direct-use screw machine drill bit for applications requiring a wire gauge size 59 (0.0410 inch) cobalt bit with a 135-degree split point and straight shank. Fits any standard drill chuck accommodating the shank diameter of this bit.

Installation Notes

This bit is installed and operated by machinists or metalworking technicians following standard shop safety practices. Secure the shank fully in the drill chuck and verify runout before drilling. Always use appropriate cutting fluid or coolant for the workpiece material to extend tool life, even though this bit does not support through-coolant delivery. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is observed.