Hertel 85707305 Jobber Drill Bit Wire 8 0.1990 in Hss Tin

Product Description

The HERTEL 85707305 is a jobber-length drill bit designed for general-purpose drilling in metal, wood, and plastics. Built from high speed steel (HSS) with a titanium nitride (TiN) coating, it delivers extended tool life and reduced friction compared to uncoated HSS. The bit is sized to wire gauge number 8, which corresponds to 0.1990 inch in decimal. It features a 118-degree standard point angle, a right-hand spiral flute, and a straight-cylindrical shank. Overall length is 3.625 inches with a flute length of 2.4375 inches. This bit is sold individually and is intended for use by machinists, maintenance technicians, and general trade professionals.

The 85707305 is suited for production and maintenance drilling applications where a wire-gauge-sized hole is required. The TiN coating reduces heat buildup during extended drilling cycles, making it appropriate for light-to-moderate duty use in ferrous and non-ferrous materials. The regular spiral and tapered web configuration with web thinning improve chip evacuation and reduce thrust force at the point. This bit fits standard drill chucks accepting a 0.1990-inch straight shank.

Key Features

• Wire size number 8 (0.1990 inch decimal) for precise gauge-specific hole sizing
• TiN coating extends tool life and reduces friction versus bare HSS
• 118-degree standard point angle for general-purpose entry on common materials
• Web-thinned tapered web reduces cutting thrust and improves point stability
• Right-hand 2-flute spiral design promotes efficient chip evacuation
• Straight-cylindrical shank fits standard keyless and keyed drill chucks

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with any drill press, hand drill, or CNC spindle accepting a 0.1990-inch straight-cylindrical shank.

Installation Notes

Secure the shank fully in the chuck before operation and verify the chuck key is removed prior to starting the drill. Use appropriate cutting fluid when drilling ferrous metals to extend bit life and manage heat. Ensure the workpiece is properly clamped to prevent movement during drilling. Inspect the cutting edges before use and replace any bit showing chipping or excessive wear.