Hertel 85707230 Jobber Drill Bit No.1 0.228in Tin Hss

Product Description

The HERTEL 85707230 is a jobber-length twist drill bit designed for general-purpose metal drilling in production and maintenance environments. Manufactured from high speed steel (HSS) with a titanium nitride (TiN) coating, it delivers improved surface hardness and extended tool life compared to uncoated HSS. The bit cuts a 0.2280 inch diameter hole, corresponding to a No. 1 wire gauge size. The standard 118-degree split point geometry with web thinning reduces the thrust required to start a hole and improves centering without a pilot. A 2-flute spiral flute design clears chips efficiently. This bit is installed and used by machinists, maintenance mechanics, and field service technicians working in metal fabrication and mechanical assembly applications.

Suited for through-hole and blind-hole drilling in mild steel, aluminum, brass, and similar materials. The straight cylindrical shank accepts standard 3-jaw drill chucks found on drill presses, hand drills, and CNC drilling centers. The 3.875-inch overall length and 2.625-inch flute length are consistent with standard jobber-length proportions, making this bit a direct fit in most general-purpose drill indexes. The TiN coating is particularly effective in higher-volume repetitive drilling cycles where uncoated HSS bits would require more frequent replacement.

Key Features

• High speed steel construction with TiN coating for extended wear resistance
• 118-degree standard point angle with web thinning for reduced entry thrust and improved self-centering
• No. 1 wire size — 0.2280 inch cutting diameter
• Right-hand spiral flute with regular helix for efficient chip evacuation
• Straight cylindrical shank — 0.2280 inch shank diameter fits standard drill chucks
• Tapered web configuration with web-thinned geometry reduces heat buildup at the point

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with any 3-jaw drill chuck or collet system accepting a 0.2280 inch straight cylindrical shank, including drill presses, portable hand drills, and CNC drilling equipment.

Installation Notes

Secure the shank fully in the chuck and verify concentricity before operating. Use appropriate cutting fluid or coolant when drilling ferrous metals to manage heat and extend bit life. Ensure workpieces are firmly clamped before drilling to prevent rotation. Always wear appropriate eye protection and follow applicable shop safety standards when operating drilling equipment.