Hertel K008177AS Spiral Flute Tap 6-40 Unf Plug Hss

Product Description

The HERTEL K008177AS is a spiral flute tap designed for cutting 6-40 UNF internal threads in ferrous and non-ferrous materials. Built from high-speed steel with a bright, uncoated finish, this plug chamfer tap features 2 flutes with a fast flute style and a 52-degree right-hand helix angle that efficiently evacuates chips ahead of the tap during through-hole operations. At 2 inches overall length with a 0.141-inch shank diameter, it is sized for use in hand tapping equipment or machine tapping setups where fine unified thread forms are required. Licensed machinists, tool and die makers, and maintenance technicians are the primary users of this tool.

This tap is suited for creating 6-40 UNF threads in through-hole applications across light manufacturing, instrument assembly, and precision maintenance work. The plug chamfer provides a gradual lead-in that works well in both hand tapping and CNC tapping cycles. The H2 thread limit tolerance makes it appropriate for Class 2B and 3B fit requirements, which are standard for general-purpose and close-tolerance fastener assemblies. The right-hand flute direction and right-hand thread form are the conventional orientation for standard fastener work.

Key Features

• 6-40 UNF thread form with H2 thread limit for Class 2B and 3B fits
• High-speed steel construction for durability across a range of workpiece materials
• 52-degree right-hand helix angle promotes forward chip ejection in through-hole tapping
• Plug chamfer for progressive thread engagement in hand or machine tapping
• Fast flute style aids chip flow and reduces torque buildup
• Bright, uncoated finish suitable for use with standard cutting fluids

Compatibility

Designed as a standard replacement or direct-use spiral flute tap for 6-40 UNF through-hole threading applications requiring Class 2B or 3B fit tolerance.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with tapping operations and thread tolerance requirements. Always secure the workpiece firmly and use an appropriate cutting fluid for the material being tapped. Ensure the tap is properly aligned with the pilot hole before beginning the threading cycle to avoid tap breakage. Inspect the tap for wear or chipping before each use, and replace if thread form integrity is compromised.