Hertel 85703890 Jobber Drill Bit Wire 12 Hss 118 Degree

Product Description

The HERTEL 85703890 is a jobber-length drill bit designed for general-purpose drilling in metal, wood, and plastics. Manufactured from high speed steel with a bright uncoated finish, this bit runs a standard 118-degree point angle with a web-thinned tip geometry that reduces thrust and improves center-starting accuracy. The straight-cylindrical shank measures 0.1890 inches in diameter, matching the wire size No. 12 designation and a decimal inch equivalent of 0.1890 inches. Overall length is 3.5 inches with a flute length of 2.3125 inches. The two-flute regular spiral design promotes consistent chip evacuation during through-hole operations. Licensed HVAC, plumbing, electrical, and mechanical contractors reach for this bit during rough-in and fixture work where a reliable jobber-length geometry is required.

This bit is suited for light-to-medium drilling applications in residential and commercial trade work. It fits standard drill chucks accepting a 0.1890-inch straight-cylindrical shank and is appropriate for bench drill presses, cordless drills, and right-angle drill drivers commonly used during mechanical, electrical, and plumbing installations. The general-purpose grade makes it a practical stock item for service vans and shop benches where wire-gauge-sized holes are needed in ferrous and non-ferrous materials.

Key Features

• Wire size No. 12 — decimal equivalent 0.1890 inches for precise fitment to wire-gauge hole charts
• High speed steel construction provides adequate hardness for drilling mild steel, aluminum, copper, and wood
• 118-degree standard point angle with web-thinned tip reduces walking and lowers required thrust force
• Two-flute regular spiral geometry promotes efficient chip clearance in through-hole drilling
• Bright uncoated finish allows visual inspection of edge condition before use
• Straight-cylindrical shank seats securely in standard three-jaw chucks without adapter sleeves

Compatibility

Designed as a general-purpose jobber-length drill bit for use in any standard drill chuck accepting a 0.1890-inch straight-cylindrical shank, including bench presses, hand drills, and right-angle drivers used in trade applications.

Installation Notes

Installation of this bit is performed by qualified tradespeople following standard drilling practices. Secure the shank fully in the chuck before operation and verify chuck key removal before powering the drill. When drilling ferrous materials, use a center punch to prevent bit walking at startup. Follow applicable workplace safety codes and wear appropriate eye protection during all drilling operations.