Hertel 84578541 Jobber Drill Bit Letter C Tin Hss 4in

Product Description

The HERTEL 84578541 is a jobber-length drill bit designed for general-purpose metal drilling in shop, maintenance, and field applications. The bit is sized at Letter C (0.2420 inches decimal equivalent) and features a 118-degree standard point angle with web thinning for easier penetration and reduced walking at startup. The cutting geometry uses a regular spiral with two flutes and a tapered web configuration. A titanium nitride (TiN) coating increases surface hardness and reduces friction, extending tool life compared to uncoated high speed steel. Overall length is 4 inches with a 2-3/4 inch flute length.

This drill bit is suited for drilling mild steel, aluminum, plastics, and similar materials in general machining and fabrication environments. The straight-cylindrical shank fits standard three-jaw drill chucks on benchtop drill presses, hand drills, and CNC drilling setups. Right-hand cut direction is compatible with conventional forward-rotation spindles. The 0.2420-inch shank diameter matches the drill bit diameter, eliminating slip-fit concerns in properly sized collets or chucks. This bit is sold individually and is appropriate for machinists, maintenance technicians, and tradespeople who need a reliable letter-size drill for clearance holes, pilot holes, or through-hole applications.

Key Features

• Letter C size — 0.2420 inches decimal equivalent, within the 0.2000 to 0.2500 inch size range
• 118-degree standard point angle with web thinning for reduced thrust and self-centering entry
• TiN coating increases wear resistance and reduces heat buildup during cutting
• High speed steel construction for use across a broad range of workpiece materials
• Regular spiral flutes with tapered web for efficient chip evacuation
• Straight-cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with any drill press, hand drill, or machine tool equipped with a standard three-jaw chuck or collet sized for a 0.2420-inch straight shank.

Installation Notes

This drill bit is installed and serviced by machinists, maintenance technicians, and tradespeople using standard drill chucks or collets. Always ensure the workpiece is securely clamped before drilling. Use appropriate cutting fluid or coolant for steel workpieces to extend bit life. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is observed.