Hertel 84578632 Jobber Drill Bit Letter L Hss Tin

Product Description

The HERTEL 84578632 is a jobber-length drill bit sized to Letter L, equivalent to 0.2900 inches decimal, ground from high speed steel and finished with a titanium nitride (TiN) coating. It features a 118-degree standard point angle with web thinning on a tapered web for improved centering and reduced thrust at entry. The spiral flute geometry is a regular right-hand cut with 2 flutes, producing clean chip evacuation in a wide range of workpiece materials. Overall length is 4.25 inches with a flute length of 2-15/16 inches. The straight-cylindrical shank diameter matches the cutting diameter at 0.2900 inches, fitting standard three-jaw drill chucks. This is a general-purpose bit suited for machinists, maintenance technicians, and metalworking trades.

The 84578632 is a general-purpose jobber drill intended for production and maintenance drilling applications in metals, plastics, and composite materials. The TiN coating extends cutting edge life compared to uncoated HSS by reducing friction and heat buildup at the cutting zone. The Letter L size falls within the 0.2500 to 0.3000 inch decimal range, a common size requirement in mechanical assembly, pipe fitting layout, and sheet metal work. It is sold individually and is compatible with standard benchtop drill presses, hand drills, and machining center drill chucks that accept straight-cylindrical shanks.

Key Features

• Letter L size, 0.2900 inches decimal diameter
• TiN coating reduces friction and extends tool life versus bare HSS
• 118-degree standard point with web thinning for improved self-centering
• Right-hand cut, 2-flute regular spiral for efficient chip removal
• Straight-cylindrical shank fits standard drill chucks without adapters
• General-purpose grade suitable for metals, plastics, and composite materials

Compatibility

Designed as an OEM-style general-purpose jobber drill for use in any standard drill chuck or collet accepting a 0.2900-inch straight-cylindrical shank.

Installation Notes

Install in a properly rated drill chuck and tighten with a chuck key before operation. Secure the workpiece in a vise or fixture before drilling to prevent movement. Apply appropriate cutting fluid for metal applications to manage heat and extend bit life. Inspect the cutting edge for wear or chipping before each use and replace the bit if the TiN coating is worn through at the tip.