Hertel K008070AS25 Spiral Point Tap 3-56 Unf Tin Hss

Product Description

The HERTEL K008070AS25 is a spiral point tap designed for cutting 3-56 UNF internal threads in through-hole applications. Manufactured from high-speed steel with a titanium nitride (TiN) coating, this tap offers increased surface hardness and wear resistance compared to uncoated HSS tooling. The spiral point geometry pushes chips forward ahead of the cutting zone, reducing clogging and improving thread quality in production environments. It features a plug chamfer, 2 flutes, and a right-hand thread direction. The 0.141-inch shank diameter and 0.5-inch thread length make it suited for close-tolerance work in small fastener applications.

This tap is used in machine shop, maintenance, and assembly operations where 3-56 UNF threads are required in steel, aluminum, and similar machinable materials. The plug chamfer style requires 3 to 5 lead threads before full engagement, making it appropriate for through-hole tapping on CNC machines, drill presses, or tapping heads. It is a standard choice for instrument, electronics, and precision mechanical assembly where small-diameter UNF threads are common.

Key Features

• Spiral point design pushes chips forward, reducing interference in through-hole tapping
• TiN coating increases surface hardness and extends tool life over uncoated HSS
• High-speed steel construction handles a broad range of machinable metals
• Plug chamfer provides gradual thread engagement across 3 to 5 lead threads
• H2 thread limit holds tight tolerance for 2B class of fit applications
• Right-hand thread direction, compatible with standard tapping equipment

Compatibility

Designed for through-hole tapping of 3-56 UNF threads; compatible with standard tapping chucks, CNC rigid tapping setups, and drill press tapping fixtures that accept a 0.141-inch shank diameter.

Installation Notes

This tap should be installed by a machinist or tool and die technician familiar with small-diameter thread cutting. Secure the tap in a properly sized chuck or tapping holder to prevent runout and tap breakage. Apply cutting fluid appropriate for the workpiece material before and during the tapping operation. Avoid excessive feed pressure on small-diameter taps to prevent breakage, and clear chips regularly when tapping blind or deep holes.