Hertel 84578053 Jobber Drill Bit Letter U Hss

Product Description

The HERTEL 84578053 is a jobber-length drill bit sized to Letter U (0.3680 inches) and manufactured from high speed steel with a bright, uncoated finish. It features a 118-degree standard point angle with web thinning and a tapered web configuration for improved chip clearance and reduced thrust at entry. The spiral flute design is a regular helix with two flutes and a right-hand cutting direction. Overall length is 5 inches with a flute length of 3-5/8 inches. The straight-cylindrical shank diameter matches the bit diameter at 0.3680 inches. This is a general-purpose drill bit suited for machinists, maintenance technicians, and trade professionals working with ferrous and non-ferrous materials.

The HERTEL 84578053 fits into general-purpose drilling applications across mechanical, HVAC, plumbing, and electrical trades where a Letter U diameter hole is required. Typical uses include clearance holes, pilot holes, and through-drilling in mild steel, aluminum, and similar materials. The jobber length provides a balanced reach-to-rigidity ratio for bench drill presses, hand drills, and drill-motor applications encountered in field and shop work. It is sold individually and fits any standard drill chuck or collet accepting a 0.3680-inch straight shank.

Key Features

• Letter U size at 0.3680 inches decimal equivalent, within the 0.3500 to 0.4000 inch size range
• 118-degree standard point angle with web thinning for reduced entry thrust
• High speed steel construction for general-purpose drilling in ferrous and non-ferrous materials
• Regular spiral flute with tapered web configuration promotes chip evacuation
• Right-hand cut, two-flute design compatible with standard drill drivers and presses
• Bright uncoated finish allows easy visual inspection for wear or damage

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with any standard drill chuck or collet accepting a 0.3680-inch straight-cylindrical shank, including bench drill presses, magnetic drills, and hand-held drill motors.

Installation Notes

Installation of this bit is performed by trade professionals and machinists using standard drill chucks or collets rated for the shank diameter. Secure the shank fully in the chuck before operation and verify the chuck key is removed prior to powering the drill. Use appropriate cutting fluid for steel applications to extend bit life and maintain dimensional accuracy. Inspect the cutting edges and point for wear before each use and replace the bit if chipping or dulling is observed.