Hertel 66692641 Jobber Drill Bit Letter F Tialn Hss

Product Description

The HERTEL 66692641 is a letter-size F jobber-length drill bit ground from high-speed steel (HSS) and coated with titanium aluminum nitride (TiAlN) for extended tool life in production and maintenance drilling. The 135-degree split point reduces thrust force on entry and self-centers on most surfaces without a pilot hole. At 0.2570 inches in diameter and 4.125 inches overall length, the bit is sized for through-holes and stepped clearance work in steel, cast iron, aluminum, and similar materials. A regular spiral flute with web thinning and a tapered web configuration promotes chip evacuation and reduces torque demand. This bit is intended for use by machinists, maintenance mechanics, and trade professionals running a drill press, CNC machine, or hand-held power drill.

The 66692641 is suited for general holemaking in metal fabrication shops, mechanical contracting, industrial maintenance, and field service applications. Its straight cylindrical shank fits standard three-jaw drill chucks across a wide range of drill presses and portable drills. The 2.875-inch flute length supports drilling to a maximum depth of 1.750 inches without repositioning. Typical applications include bolt clearance holes, pilot drilling, and light production runs where a coated HSS bit is preferred over solid carbide for toughness and cost efficiency.

Key Features

• TiAlN coating reduces heat buildup and extends cutting life versus uncoated HSS bits
• 135-degree split point self-centers and lowers feed force at entry
• Web-thinned tapered web reduces torque and improves chip flow
• Right-hand cut with regular spiral flute for standard drilling operations
• Heavy-duty grade HSS construction handles interrupted cuts and harder workpiece materials
• Straight cylindrical shank fits standard drill chucks without an adapter

Compatibility

Designed as an OEM-style jobber drill replacement for any application requiring a letter-size F diameter straight-shank drill bit conforming to NAS specification standards.

Installation Notes

Install the shank fully into the drill chuck and tighten all chuck jaws evenly before operation. Disengage and lock out power to the machine before changing bits. Use appropriate cutting fluid or coolant on the workpiece when drilling ferrous metals to manage heat even though this bit does not support coolant-through delivery. Follow applicable shop safety codes and manufacturer feed-rate recommendations for HSS tooling when setting spindle speed.