Hertel 2385839 Screw Machine Drill Bit 7/64 Inch Hss

Product Description

The HERTEL 2385839 is a screw machine length drill bit ground from high-speed steel with an oxide coating for added surface hardness and corrosion resistance. At 7/64 inch (0.1094 inch decimal) diameter and 1-13/16 inches overall length, it is shorter than jobber-length bits, which reduces deflection and improves hole location accuracy in tight-clearance applications. The 135-degree split point starts on contact without a center punch and lowers the thrust needed to penetrate workpiece material. The parallel-web, web-thinned construction further reduces axial load. This bit is suited to production drilling and general metalworking where rigidity and repeatability matter.

Screw machine length drill bits like the 2385839 are used in drill presses, CNC machining centers, turret lathes, and hand-held power drills wherever a stubby, rigid tool is preferred over a standard jobber bit. The short flute length of 13/16 inches limits chip packing in shallow-hole drilling operations on steel, aluminum, cast iron, and similar materials. Machinists, tool-and-die workers, and maintenance mechanics reach for this format when drilling close to a shoulder, inside a confined space, or through a drill bushing.

Key Features

• 135-degree split point starts on contact and reduces required thrust, eliminating the need for a center punch on most metals
• Web-thinned, parallel-web construction lowers axial cutting force and improves chip evacuation
• High-speed steel construction withstands the heat generated in continuous production drilling cycles
• Oxide surface finish adds a degree of surface hardness and light lubricity to reduce galling
• Screw machine (stub) length minimizes deflection and improves positional accuracy versus jobber-length bits
• Right-hand spiral flute, straight-cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as a heavy-duty OEM-style replacement or stock drill bit for use in standard straight-shank drill chucks on drill presses, machining centers, and hand-held power drills accepting 7/64 inch shank tooling.

Installation Notes

Secure the straight-cylindrical shank fully into the chuck jaws and tighten with a chuck key before beginning any drilling operation. Power down and de-energize the machine before changing bits or adjusting workpiece fixturing. Use appropriate cutting fluid or coolant for the workpiece material to extend tool life; this bit does not support through-coolant delivery. Inspect the split point for chipping before each use, as a damaged point will cause walking and inaccurate hole placement.