Hertel 71206387 Jobber Drill Bit Wire 21 0.1590 Hss

Product Description

The HERTEL 71206387 is a jobber-length drill bit sized to wire gauge 21, with a decimal diameter of 0.1590 inches. Constructed from high speed steel with an oxide coating, it is built for general-purpose drilling in metal, wood, and plastic. The 118-degree standard point angle provides a reliable entry geometry suited to a wide range of workpiece materials. With a straight-cylindrical shank and two spiral flutes in a regular helix pattern, this bit seats securely in standard drill chucks and evacuates chips efficiently during through-hole and blind-hole operations. Licensed machinists, maintenance technicians, HVAC fabricators, and electricians commonly reach for wire-gauge bits in this size range for pilot holes, sheet metal work, and conduit preparation.

This bit is sized within the 0.1500 to 0.2000 inch decimal range and fits applications where precise small-diameter holes are required. A tapered web with web-thinning reduces thrust at the cutting tip, making it easier to start holes cleanly without a center punch on softer substrates. The 3-1/4 inch overall length and 2-1/8 inch flute length give adequate reach for most light fabrication and service tasks. Each unit is sold individually and is intended for use in hand drills, drill presses, or machine tool setups.

Key Features

• Wire gauge 21 diameter — 0.1590 inches decimal — for precise small-hole drilling
• High speed steel construction with oxide coating for wear resistance and reduced friction
• 118-degree standard point angle for broad material compatibility
• Two spiral flutes with regular helix and tapered web for efficient chip evacuation
• Web-thinned tip reduces cutting thrust and improves hole-start accuracy
• Straight-cylindrical shank fits standard three-jaw drill chucks without adapters

Compatibility

Designed as a general-purpose replacement or stock bit for standard three-jaw drill chucks accepting a 0.1590-inch straight-cylindrical shank across hand drills, drill presses, and light machine tool setups.

Installation Notes

This bit is installed and removed by a licensed machinist, maintenance technician, or qualified trade professional using a standard chuck key or keyless chuck. Secure the workpiece before drilling and confirm the chuck is fully tightened before operation. Use appropriate cutting fluid when drilling ferrous metals to extend bit life and improve hole quality. Inspect the cutting edges for wear before each use and replace the bit if the point is chipped or the flutes are clogged.