Hertel 84581131 Jobber Drill No. 39 Hss 135 Deg

Product Description

The HERTEL 84581131 is a No. 39 wire gauge jobber-length drill bit designed for general-purpose holemaking in metal, wood, and composite materials. Ground from high speed steel with an oxide coating for added lubricity and surface protection, it features a 135-degree split point that self-centers on entry and reduces the need for a center punch. The web-thinned, tapered web construction reduces thrust and improves chip evacuation. At 0.0995 inches in decimal diameter, this drill is built to heavy-duty grade standards and suits applications where tight hole tolerances are required in small-diameter work.

This bit is suited for production and maintenance drilling tasks in shop, field, and light manufacturing environments. The jobber-length format provides a balance of reach and rigidity appropriate for drilling sheet metal, structural steel, aluminum, and similar materials. A straight-cylindrical shank ensures direct chuck compatibility with standard 3-jaw drill chucks on hand drills, drill presses, and CNC equipment. The right-hand spiral flute design pulls chips up and out of the hole during standard clockwise operation.

Key Features

• No. 39 wire size, 0.0995-inch decimal diameter for small-bore precision holemaking
• 135-degree split point self-centers and reduces walking on smooth or curved surfaces
• High speed steel construction with oxide coating for improved wear resistance and lubricity
• Web-thinned tapered web reduces drilling thrust and improves chip flow
• Regular spiral, 2-flute right-hand cutting for standard clockwise operation
• Heavy-duty grade classification per NAS specification designation

Compatibility

Designed as a standard jobber-length drill bit for use with any 3-jaw drill chuck accommodating a 0.0995-inch straight-cylindrical shank, including hand drills, drill presses, and compatible CNC spindles.

Installation Notes

This drill bit is installed by machinists, tool and die workers, maintenance technicians, and general fabricators. Secure the straight shank firmly in a properly sized 3-jaw chuck before use, ensuring the bit runs true with minimal runout. Use appropriate cutting fluid or coolant for steel and ferrous materials to extend tool life. Inspect the cutting edges and point condition before each use and replace bits that show signs of chipping, dulling, or burning.