Hertel 85707438 Jobber Drill Bit No. 21 Hss Tin

Product Description

The HERTEL 85707438 is a jobber-length twist drill bit sized to wire gauge No. 21, with a decimal diameter of 0.1590 inches. Constructed from high speed steel (HSS) with a titanium nitride (TiN) coating, this bit is built for general-purpose drilling across metal, wood, and plastic substrates. The 118-degree standard point angle suits a wide range of materials without requiring a dedicated point geometry. With an overall length of 3.25 inches and a flute length of 2.125 inches, it fits standard drill chucks and benchtop drill presses used daily in trade and production environments. Licensed machinists, maintenance technicians, and fabricators are the primary users.

This bit is suited for general-purpose hole-making in light to medium-duty applications. The straight-cylindrical shank with a diameter of 0.1590 inches seats securely in keyless and keyed drill chucks. The regular spiral flute geometry with a tapered web and web-thinned point supports efficient chip evacuation during through-hole drilling. It is appropriate for use in handheld drills, drill presses, and light CNC or turret setups where a standard jobber-length reach is sufficient.

Key Features

• Wire gauge No. 21 size, 0.1590 inch decimal diameter for precise hole sizing
• High speed steel construction with TiN coating for extended wear resistance
• 118-degree standard point angle for broad material compatibility
• Web-thinned, tapered web point reduces thrust and improves penetration
• Right-hand cut, regular spiral flute promotes consistent chip removal
• Straight-cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as a general-purpose jobber-length drill bit for use in standard 3-jaw drill chucks accepting a 0.1590 inch straight shank, including handheld drills, drill presses, and compatible light machine tool setups.

Installation Notes

Secure the shank fully in the chuck jaws before applying power and verify the bit runs true before drilling. Always power down and isolate the drill press or handheld tool before changing bits. Use appropriate cutting fluid when drilling ferrous metals to extend bit life. Follow applicable shop safety practices and PPE requirements when operating rotary cutting tools.