Hertel 66693813 Jobber Drill Bit Letter H 0.2660 in Hss Tin

Product Description

The HERTEL 66693813 is a Letter H jobber-length drill bit ground from high speed steel and coated with titanium nitride (TiN) for extended tool life. It cuts a 0.2660 inch diameter hole with a 135-degree split point that reduces walking on entry and lowers the thrust needed to start a cut. Overall length is 4-1/8 inches, with a 2-7/8 inch flute length and a straight cylindrical shank measuring 0.2660 inch in diameter. The two-flute spiral design clears chips efficiently, and the web-thinned, tapered web geometry keeps cutting forces manageable in both hand-feed and machine-feed applications. Rated heavy duty and conforming to NAS specification, this bit is suited for production and maintenance drilling tasks.

This drill bit is intended for general holemaking in metal, wood, and similar materials where a jobber-length reach is appropriate. The 135-degree split point performs well in steel, aluminum, and mild alloys without a center-punch start on most workpieces. It is commonly used by machinists, maintenance technicians, and metalworking trades in drill presses, CNC machining centers, and hand-held power drills with a standard 3-jaw chuck. The TiN coating reduces friction and surface heat buildup during extended run cycles, making it a practical choice for repetitive production drilling where bit longevity matters.

Key Features

• 135-degree split point reduces walking on entry and lowers feed pressure
• TiN coating extends cutting life and reduces friction heat
• Web-thinned tapered web improves chip clearance and cutting efficiency
• High speed steel construction handles a wide range of workpiece materials
• Right-hand spiral flutes clear chips toward the shank during drilling
• NAS specification compliance supports use in controlled manufacturing environments

Compatibility

Designed as a standard jobber-length drill bit with a 0.2660 inch straight cylindrical shank, compatible with any drill press, hand drill, or machining center chuck sized to accept that shank diameter.

Installation Notes

Secure the shank fully in a properly sized drill chuck before operating. Always power down and de-energize the machine before changing bits. Use appropriate cutting fluid or coolant when drilling ferrous metals to manage heat and extend bit life. Follow applicable shop safety practices and any relevant machine-specific operating procedures when selecting feed rate and spindle speed for the workpiece material.