Hertel 84579838 Jobber Drill 7/16 Inch 135 Deg Tin Hss

Product Description

The HERTEL 84579838 is a jobber-length drill bit designed for general-purpose holemaking in metal and other industrial materials. It is made from high speed steel with a titanium nitride (TiN) coating that increases surface hardness and extends tool life by reducing friction and heat buildup at the cutting edge. The split point geometry at 135 degrees allows the bit to self-center on contact, reducing the need for a center punch on most surfaces. The web-thinned, tapered web configuration improves chip evacuation and reduces thrust requirements. This bit is installed and used by machinists, maintenance technicians, and trade professionals working with drill presses, hand drills, or CNC equipment.

This jobber drill is suited for heavy-duty holemaking applications across metalworking, mechanical maintenance, and fabrication environments. The straight-cylindrical shank fits standard three-jaw drill chucks without adapters. With an overall length of 5.5 inches and a flute length of 4.0625 inches, it handles typical through-hole and blind-hole operations in the 0.4000 to 0.5000 inch drill size range. The right-hand spiral flute design is compatible with standard forward-rotation drilling equipment.

Key Features

• TiN coating increases wear resistance and reduces cutting friction for longer tool life
• 135-degree split point self-centers on the workpiece, minimizing walking and reducing need for center punching
• Web-thinned tapered web reduces axial thrust and improves chip flow
• High speed steel construction handles a wide range of metals and general-purpose materials
• Regular spiral, two-flute design promotes efficient chip evacuation
• Heavy-duty grade construction rated to NAS specification

Compatibility

Designed as an OEM-style jobber drill replacement fitting any standard drill chuck accepting a 0.4375-inch straight-cylindrical shank. Suitable for use in drill presses, hand drills, and CNC drilling equipment configured for right-hand rotation.

Installation Notes

Installation and use of this drill bit is performed by machinists and trade professionals familiar with rotary cutting tools. Ensure the drill chuck is fully tightened and the workpiece is securely clamped before operation. Disconnect or de-energize the drill press or machine tool before changing bits. Follow applicable shop safety standards and use appropriate cutting fluid or coolant for the material being drilled where required.