Hertel 74147612 Cobalt Drill Bit 51/64 in 1/2 in Shank

Product Description

The HERTEL 74147612 is a reduced shank cobalt drill bit designed for drilling into tough, high tensile strength materials. Built from cobalt steel, this bit holds up under the heat and stress that standard high-speed steel cannot handle. The drill point is ground to a 118-degree standard point angle, making it suitable for general-purpose drilling on hard ferrous metals and alloys. At 5 inches overall length with a 3-inch flute length and an oxide straw finish, this bit is a reliable production-floor and maintenance choice for machinists, tool-and-die shops, and industrial maintenance professionals.

This bit is intended for use in applications where the drill diameter exceeds the available spindle collet or chuck capacity. The 51/64-inch cutting diameter is paired with a reduced 1/2-inch straight-cylindrical shank, allowing the bit to seat in standard 1/2-inch drill chucks on drill presses, magnetic drills, or CNC machining centers. Right-hand spiral flute geometry supports efficient chip evacuation during through-hole and blind-hole drilling operations on tough high tensile strength workpieces.

Key Features

• Cobalt construction resists heat and wear when drilling hard, high tensile strength materials
• 118-degree standard point angle for general-purpose drilling on ferrous metals and alloys
• Reduced 1/2-inch straight-cylindrical shank fits standard 1/2-inch drill chucks
• Oxide straw finish provides light corrosion resistance and reduces friction during entry
• Regular spiral, right-hand cut flute geometry promotes consistent chip clearance
• 3-inch maximum drilling depth with 5-inch overall length for controlled reach

Compatibility

Designed as a reduced shank replacement bit for use in any 1/2-inch drill chuck application requiring a 51/64-inch bore diameter in tough high tensile strength materials.

Installation Notes

Secure the 1/2-inch shank fully into the chuck before operation and confirm the set screw or chuck key is tightened to manufacturer specification. Use appropriate cutting fluid or coolant for the workpiece material, as cobalt bits can sustain heat but fluid extends tool life. A licensed machinist or qualified industrial maintenance technician should verify spindle speed and feed rate are appropriate for the workpiece before drilling. Inspect the cutting edges for wear or chipping before each use and replace if edges show visible degradation.