Hertel 85707420 Jobber Drill Bit Wire 20 Hss Tin

Product Description

The HERTEL 85707420 is a jobber-length drill bit designed for general-purpose metal drilling in production and maintenance environments. It carries a wire gauge size of 20, corresponding to 0.1610 inches in decimal, and is manufactured from high speed steel with a titanium nitride (TiN) coating that extends tool life by reducing friction and heat buildup at the cutting edge. The 118-degree standard point angle suits most common drilling applications in steel, aluminum, and similar materials. Overall length is 3.25 inches with a 2.125-inch spiral flute. Licensed tradespeople and machinists working on light fabrication, HVAC component drilling, and electrical panel work will find this bit a reliable general-purpose choice.

This bit is suited for drilling in mild steel, aluminum, brass, and plastics in both shop and field settings. The straight-cylindrical shank fits standard three-jaw chucks on benchtop drill presses, hand drills, and right-angle drills commonly used by HVAC technicians, electricians, and plumbers. The regular spiral flute geometry and tapered web configuration aid chip evacuation during through-hole drilling. Web thinning at the tip reduces thrust force and improves centering on entry, which is useful when working in tight spaces or without a drill press.

Key Features

• Wire size 20 diameter: 0.1610 inches for precise hole sizing
• TiN coating reduces friction and extends cutting edge life compared to uncoated HSS
• 118-degree standard point angle for general-purpose use in common metals and plastics
• Web-thinned tapered web reduces entry thrust and improves bit self-centering
• Right-hand cut, 2-flute regular spiral geometry promotes efficient chip removal
• Straight-cylindrical shank fits standard three-jaw chucks without adapters

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with any standard three-jaw chuck accepting a 0.1610-inch straight-cylindrical shank, including benchtop drill presses, corded hand drills, and cordless drill drivers.

Installation Notes

A licensed machinist, electrician, plumber, or HVAC technician can install this bit by securing the straight shank firmly in a calibrated three-jaw chuck before use. Ensure the workpiece is clamped or secured before drilling to prevent rotation. Use cutting fluid when drilling mild steel to manage heat and prolong bit life. Inspect the cutting edge before each use and replace immediately if the TiN coating is worn through or the tip shows visible damage.