Hertel 84578707 Jobber Drill Bit Letter S Hss Tin

Product Description

The HERTEL 84578707 is a jobber-length twist drill bit sized to Letter S (0.3480 inches) for general-purpose drilling in metal, wood, and plastics. Built from high speed steel (HSS) with a titanium nitride (TiN) coating, the bit resists heat and wear during extended use. The 118-degree standard point angle suits a wide range of materials and is compatible with most bench-top and handheld drill presses. Two spiral flutes clear chips efficiently, and the web-thinned, tapered web design reduces thrust at the start of the cut. Overall length is 4-7/8 inches with a 3-1/2-inch flute length, giving adequate depth for most jobber-length applications. The straight-cylindrical shank seats securely in standard drill chucks.

This bit is intended for trade and industrial use where a reliable general-purpose jobber drill is needed. It is well suited for HVAC installers, plumbers, electricians, and general contractors drilling through sheet metal, structural steel, copper, aluminum, and similar materials on the job site or in a shop environment. The right-hand cut and regular spiral geometry make it a standard replacement for worn or broken Letter S bits in daily rotation.

Key Features

• Letter S size: 0.3480 inches decimal equivalent
• High speed steel construction with TiN coating for extended tool life
• 118-degree standard point angle for broad material compatibility
• Web-thinned, tapered web reduces entry thrust and walking
• Two-flute spiral design promotes chip evacuation
• Straight-cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as a general-purpose jobber-length drill bit suitable for use in standard 3-jaw drill chucks accepting a 0.3480-inch straight shank.

Installation Notes

Installation should be performed by a qualified tradesperson familiar with rotary cutting tools. Secure the shank fully in the chuck and verify concentricity before drilling. Always wear appropriate eye protection and secure the workpiece before starting the drill. Inspect the cutting edges and TiN coating before each use and replace the bit if the edge is chipped or the coating is worn through at the point.