Hertel 84580497 Letter B Jobber Drill Bit Hss

Product Description

The HERTEL 84580497 is a Letter B jobber-length drill bit ground from high speed steel with a black oxide coating. It features a 135-degree split point that self-centers on contact, reducing walking and the need for a center punch. The web-thinned, tapered web construction lowers thrust requirements and improves chip evacuation through the two spiral flutes. At 4 inches overall length with a 2.75-inch flute length, this is a standard jobber-series geometry suited for general-purpose holemaking in a wide range of materials. Licensed tradespeople and machinists working in HVAC, plumbing, electrical, and mechanical service use this bit for drilling steel, iron, and similar ferrous stock.

This drill bit is rated for heavy-duty grade service and carries a NAS specification designation, making it appropriate for production and maintenance drilling applications. The straight-cylindrical shank at 0.2380 inches diameter seats directly into standard three-jaw chucks and keyed drill chucks on portable drills, drill presses, and magnetic base drills. It is a right-hand cutting, regular spiral bit without coolant-through capability, best suited for dry or externally lubricated drilling of mild to medium-hardness metals typical in trade and light industrial work.

Key Features

• Letter B size — 0.2380 inches decimal equivalent for precise hole sizing
• 135-degree split point self-centers and reduces walking without a center punch
• Web-thinned tapered web lowers feed force and improves chip flow
• Black oxide coating provides mild lubricity and corrosion resistance during storage
• High speed steel construction handles ferrous metals and general-purpose drilling
• NAS specification designation — heavy-duty grade jobber series

Compatibility

Designed as a general-purpose jobber-series drill bit with a 0.2380-inch straight-cylindrical shank compatible with standard three-jaw and keyed drill chucks across portable drills and stationary drill presses.

Installation Notes

Installation is performed by machinists, maintenance technicians, and licensed tradespeople using standard drill equipment. Secure the shank fully in the chuck and confirm the bit runs true before drilling. Apply cutting fluid or lubricant when drilling ferrous metals to extend tool life and improve hole finish. Inspect the cutting edges for wear before each use and replace the bit if the split point or cutting lips show damage.