Hertel K010314AS Thread Forming Tap 4-40 Unc Plug Hss

Product Description

The HERTEL K010314AS is a thread forming tap designed for creating internal threads in ductile metals without cutting or removing material. Operating on a cold-forming principle, it displaces material to generate strong, work-hardened threads. This plug-chamfer tap is configured for 4-40 UNC threading with a 2B and 3B class of fit, making it suitable for precision fastening applications in manufacturing, assembly, and maintenance environments. The high-speed steel construction provides durability across a range of ferrous and non-ferrous workpieces. With an overall length of 1.875 inches and a thread length of 0.5625 inches, it fits standard tap holders used by machinists and maintenance technicians.

This tap is used in through-hole threading applications where a clean, chip-free thread form is required. Its plug chamfer with 3 to 5 chamfered threads makes it well suited for through-holes in production and repair settings. The right-hand thread direction and H3 thread limit support consistent fitment with standard 4-40 UNC fasteners. It is commonly used by machinists, tool and die technicians, and maintenance professionals working with sheet metal, aluminum, and other machinable materials in light industrial and precision assembly contexts.

Key Features

• Thread forming design produces chip-free internal threads by displacing rather than cutting material
• 4-40 UNC thread size with 2B and 3B class of fit for standard fastener compatibility
• Plug chamfer with 3 to 5 chamfered threads for easy starting in through-holes
• High-speed steel construction for wear resistance across a variety of workpiece materials
• H3 thread limit ensures consistent thread tolerance control
• Right-hand thread direction with bright uncoated finish

Compatibility

Designed as an OEM-style replacement or direct-use thread forming tap for standard 4-40 UNC through-hole threading applications in compatible tap holders and tapping machines.

Installation Notes

Thread forming taps require the correct tap drill size for the specific thread and material - consult a thread forming drill chart before use, as forming taps use a larger pilot hole than cutting taps. Use appropriate tapping fluid or cutting oil to reduce friction and extend tool life. Secure the workpiece firmly and use a calibrated torque driver or tapping machine to avoid tap breakage. Follow applicable workplace safety standards when operating rotating tooling.