Hertel 61699179 Screw Machine Drill Bit 27/64 Inch Hss

Product Description

The HERTEL 61699179 is a screw machine length drill bit designed for general-purpose drilling in metal, wood, and plastic. Built from high-speed steel with an oxide coating, it delivers reliable performance in production and maintenance environments. The 27/64 inch (0.4219 inch decimal) diameter and 118-degree standard point angle make it suitable for a wide range of materials and drilling conditions. At 3-3/8 inches overall length, the stubby screw machine format provides added rigidity over jobber-length bits, reducing deflection in short-hole applications. Machinists, tool-and-die workers, and maintenance technicians are the primary installers and users.

This drill bit is well suited for use in drill presses, CNC machining centers, manual mills, and handheld power drills where a shorter, stiffer bit is preferred. The 2-inch flute length accommodates shallow to moderate depth holes, and the regular spiral flute promotes efficient chip evacuation. The straight-cylindrical shank fits standard drill chucks without adapters. It is appropriate for general shop use, light production runs, and field maintenance work across manufacturing, fabrication, and mechanical service trades.

Key Features

• 27/64 inch diameter (0.4219 inch decimal) for precise sizing within the 0.4000 to 0.4500 inch range
• 118-degree standard point angle for general-purpose drilling across common materials
• High-speed steel construction provides heat resistance during extended use
• Oxide coating reduces friction and offers light corrosion resistance
• Screw machine length (3-3/8 inches OAL) adds rigidity and reduces bit deflection
• Right-hand cut with regular spiral flutes for efficient chip clearing
• Straight-cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as a general-purpose screw machine length drill bit compatible with standard drill chucks accepting a straight-cylindrical shank in the applicable diameter range, conforming to ANSI specification designation.

Installation Notes

This bit is installed by machinists and maintenance technicians using standard drill chucks on presses, mills, or handheld drills. Ensure the chuck is fully tightened and the workpiece is securely clamped before drilling. Use appropriate cutting fluid for metal applications to extend tool life and maintain hole quality. Inspect the cutting edges for wear or damage before each use and replace the bit if chipping or dulling is observed.