Hertel 84578509 Jobber Drill Bit Letter a Hss Tin

Product Description

The HERTEL 84578509 is a jobber-length twist drill bit sized to Letter A (0.2340 inches) and manufactured from high speed steel with a titanium nitride (TiN) coating. The TiN coating increases surface hardness and reduces friction at the cutting edge, extending tool life in repetitive drilling applications. The bit features a 118-degree standard point angle with web thinning on a tapered web, which reduces the force required to start and advance the drill. At 3.875 inches overall length with a 2.625-inch flute length, this is a standard jobber proportion suited to general-purpose work in metal, wood, and plastics. Machinists, maintenance mechanics, and trade professionals install this bit in conventional drill presses, hand drills, and CNC setups.

This bit is suited to general-purpose drilling in light industrial, maintenance, and trade-shop environments. The straight-cylindrical shank at 0.2340 inches diameter fits standard three-jaw chucks without modification. The two-flute spiral design with a regular helix clears chips efficiently in both through-hole and blind-hole drilling on ferrous and non-ferrous materials. It covers the 0.2000 to 0.2500-inch drill size range when Letter A sizing is called out on fabrication drawings or task sheets.

Key Features

• Letter A size — 0.2340 inches decimal equivalent
• TiN coating for increased wear resistance and reduced cutting friction
• 118-degree standard point angle with web thinning for easier penetration
• Two-flute regular spiral design for efficient chip evacuation
• Straight-cylindrical shank fits standard three-jaw chucks
• General-purpose high speed steel construction for metal, wood, and plastics

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with any standard three-jaw drill chuck or collet system accepting a 0.2340-inch straight-cylindrical shank.

Installation Notes

Secure the shank fully in the chuck jaws and verify concentricity before beginning a drilling operation. Always use appropriate cutting fluid when drilling ferrous metals to extend bit life and improve hole finish. Wear ANSI-rated eye protection during all drilling operations. Inspect the cutting edges for chipping or wear before each use and replace the bit if the TiN coating is worn through at the point.