Hertel 66693136 Jobber Drill Bit Wire 27 135 Deg Hss Tialn

Product Description

The HERTEL 66693136 is a wire gauge size 27 jobber-length drill bit ground from high speed steel and finished with a TiAlN (titanium aluminum nitride) coating. The 135-degree split point geometry reduces walking on entry and lowers the thrust needed to start a hole, making it a reliable choice for production drilling and general holemaking in metal, steel, and similar materials. The web-thinned, tapered web construction keeps cutting forces low across the full 1.875-inch flute length. Overall length is 3 inches, and the straight-cylindrical shank measures 0.1440 inches in diameter, matching the bit diameter for use in standard drill chucks and collet holders. This is a heavy-duty grade bit rated to the NAS specification.

Suited for use in CNC machining centers, drill presses, and handheld power drills wherever a wire gauge size 27 hole is required. The 0.1440-inch decimal diameter falls within the 0.1000 to 0.1500-inch bit size range, making it a common choice for tapping pilot holes, through-holes in mild steel plate, and precision holemaking applications in fabrication and maintenance environments. Right-hand cutting direction is standard for conventional drill spindles. The TiAlN coating adds surface hardness and heat resistance, extending tool life in dry or minimal-lubrication drilling setups.

Key Features

• Wire gauge size 27 (0.1440 inches decimal) with matching straight-cylindrical shank diameter
• 135-degree split point reduces drill walk and lowers entry thrust on hard or smooth workpiece surfaces
• TiAlN coating improves heat resistance and extends tool life in dry-cutting and high-speed applications
• Web-thinned tapered web reduces cutting resistance through the full flute length
• Heavy-duty grade construction rated to NAS specification for consistent performance in production use
• Regular spiral, 2-flute design provides efficient chip evacuation in a 3-inch overall length package

Compatibility

Designed as a standard jobber-length drill bit for use in any drill chuck or collet holder accepting a 0.1440-inch straight-cylindrical shank, including CNC machining centers, drill presses, and handheld power drills with compatible chuck capacities.

Installation Notes

Installation and use should be performed by machinists, maintenance technicians, or trade professionals familiar with rotating cutting tools and safe drilling practices. Secure the shank fully in the chuck or collet before operation, and verify the spindle is at a full stop before changing or inspecting the bit. Use appropriate cutting fluid or dry-cutting practices consistent with the workpiece material and the TiAlN coating specification. Inspect the cutting edges for wear or chipping before each use and replace the bit if the point geometry is compromised.