Hertel 66692716 Jobber Drill Bit Letter K Hss Tialn

Product Description

The HERTEL 66692716 is a jobber-length drill bit sized to Letter K (0.2810 inches) and designed for general-purpose holemaking in metal, wood, and composite materials. Built from high speed steel with a TiAlN coating, it resists heat and wear during high-cycle drilling applications. The 135-degree split point reduces walking on entry and lowers thrust force, making it well suited for hand-fed and machine-fed drilling. The web-thinned, tapered web configuration improves chip evacuation and cutting efficiency. This bit is a heavy-duty grade tool installed by machinists, maintenance technicians, and trade professionals who need consistent, accurate holes across production or field work.

This drill bit is appropriate for use in drill presses, CNC machining centers, and handheld power drills where a straight-cylindrical shank is accepted. It covers the 0.2500 to 0.3000 inch drill size range and is classified under the NAS specification designation, indicating suitability for demanding industrial and aerospace-adjacent applications. The right-hand spiral flute design handles standard drilling operations in a wide range of materials. It is sold individually and is a direct replacement for any standard Letter K jobber-length drill bit.

Key Features

• Letter K size (0.2810 inches decimal) for precise hole sizing in the 0.25 to 0.30 inch range
• TiAlN coating extends tool life by reducing heat buildup and surface wear
• 135-degree split point with web thinning reduces entry thrust and eliminates center punching on most metals
• Regular spiral flute with tapered web configuration promotes efficient chip clearance
• Straight-cylindrical shank fits standard drill chucks without adapters
• Heavy-duty grade high speed steel construction rated to NAS specification

Compatibility

Designed as a standard jobber-length replacement drill bit for any drill press, CNC machine, or handheld power tool accepting a 0.2810-inch straight-cylindrical shank and a Letter K size bit.

Installation Notes

Secure the shank fully in the chuck before drilling and verify chuck key is removed before powering the tool. Use appropriate cutting fluid or coolant for ferrous metals to extend bit life, even though this bit does not support coolant-through delivery. Inspect the cutting edges before each use and replace if chipping or excessive wear is observed. Disposal of worn HSS tooling should follow local regulations for metal waste.