Hertel 85703981 Jobber Drill Bit Wire 21 0.1590 in Hss

Product Description

The HERTEL 85703981 is a jobber-length drill bit sized to wire gauge No. 21, with a decimal diameter of 0.1590 inches. It is manufactured from high speed steel with a bright uncoated finish and is intended for general-purpose drilling in metal, wood, and plastics. The bit features a standard 118-degree split-point geometry with web thinning for improved center penetration and reduced walking on entry. With a straight-cylindrical shank and right-hand spiral flute configuration, it fits standard drill chucks and is compatible with handheld drills, drill presses, and CNC equipment. Machinists, maintenance technicians, pipefitters, and general fabricators routinely use this size for pilot holes, clearance holes, and light production drilling.

This bit is suited for general-purpose shop and field drilling applications in light to medium-duty ferrous and non-ferrous materials. The 0.1590-inch diameter falls within the 0.1500 to 0.2000 inch size range and is a common choice for tapping pilots and close-tolerance clearance holes in maintenance and fabrication environments. It is sold individually per package with a minimum order quantity of 12 units, making it appropriate for tool crib stocking and production floor replenishment.

Key Features

• Wire gauge No. 21 diameter — 0.1590 inches decimal equivalent for precise hole sizing
• High speed steel construction provides durability in general-purpose drilling applications
• 118-degree standard point angle with web thinning reduces thrust and improves bit startup
• Regular spiral flute with tapered web configuration promotes chip evacuation
• Straight-cylindrical shank at 0.1590 inches fits standard drill chucks without adapters
• Bright uncoated finish allows easy visual inspection of the cutting edge condition

Compatibility

Designed as a general-purpose jobber-length drill bit suitable for use in standard drill chucks accepting straight-cylindrical shanks in the 0.1590-inch diameter range.

Installation Notes

Installation and use of this bit should be performed by machinists, maintenance technicians, or trade professionals familiar with drilling operations and machine safety. Secure the workpiece and verify chuck tightness before operation. Follow applicable shop safety protocols, including eye protection and appropriate spindle speed selection for the material being drilled. Inspect the cutting edges for wear or chipping before each use and replace the bit if the point shows signs of dulling to avoid overheating or workpiece damage.