Hertel 2386589 Screw Machine Drill Bit Size 51 Hss

Product Description

The HERTEL 2386589 is a screw machine length drill bit designed for short-reach, high-production drilling in metal fabrication, machining, and mechanical assembly applications. Built from high-speed steel with an oxide coating, this bit offers improved lubricity and heat resistance compared to uncoated HSS tooling. It carries a wire gauge size of 51, translating to a decimal diameter of 0.0670 inches. The 135-degree split point promotes fast, self-centering engagement with minimal walking on hard surfaces. The web-thinned, parallel-web construction reduces cutting thrust and helps maintain hole accuracy in close-tolerance work. Licensed machinists, tool-and-die technicians, and mechanical tradespeople are the primary users of this bit style.

Screw machine length drill bits are shorter than jobber-length bits, making them well suited for drill presses, CNC machining centers, turret lathes, and screw machines where rigidity and reduced deflection matter. The straight-cylindrical shank seats directly into standard drill chucks and collet holders without adapters. This bit is appropriate for drilling mild steel, aluminum, brass, and similar non-hardened materials in production and maintenance environments where small-diameter precision holes are required.

Key Features

• Wire gauge size 51, 0.0670-inch diameter for small-bore precision drilling
• 135-degree split point for self-centering startup and reduced thrust
• Web-thinned parallel web lowers cutting force and improves chip clearance
• High-speed steel construction with oxide coating for heat and wear resistance
• Screw machine length overall at 1-11/16 inches for maximum rigidity in tight setups
• Right-hand spiral flute, straight-cylindrical shank fits standard chucks and collets

Compatibility

Designed as an OEM-style replacement or direct-use screw machine drill bit compatible with standard drill chucks and collet holders accepting a 0.0670-inch straight-cylindrical shank.

Installation Notes

Installation and use of this drill bit should be performed by a qualified machinist or mechanical tradesperson familiar with cutting tool setup and speeds-and-feeds selection. Secure the shank fully in the chuck or collet before operation and verify runout is within acceptable tolerance for the application. Do not exceed the recommended surface footage for high-speed steel tooling in the material being drilled, and use cutting fluid where appropriate to extend tool life. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is observed.