Hertel K008361AS25 Spiral Point Tap 1/4-28 Unf Tin

Product Description

The HERTEL K008361AS25 is a spiral point plug tap designed for cutting right-hand internal threads in through-hole applications. Manufactured from high-speed steel and coated with titanium nitride (TiN), it produces clean 1/4-28 UNF threads with consistent accuracy. The spiral point geometry pushes chips forward ahead of the cut, making it well-suited for through-hole work where chip evacuation is critical. With a thread limit of H1 and a 1-inch thread length, this tap meets close-tolerance threading requirements in production and maintenance environments. Machinists, tool and die technicians, and maintenance pros use this tap in CNC machines, drill presses, and hand-tapping setups.

This tap is appropriate for threading 1/4-28 UNF through holes in a range of materials where high-speed steel tooling is standard. The TiN coating extends tool life by reducing friction and increasing surface hardness compared to uncoated HSS. The plug chamfer (3-5 thread lead) makes it suitable for starting in existing holes or following a bottoming operation. It is commonly used in light manufacturing, equipment repair, and general machining applications requiring unified fine-thread fastener preparation.

Key Features

• 1/4-28 UNF thread form for unified fine-thread applications
• Spiral point geometry pushes chips forward, ideal for through-hole threading
• Titanium nitride (TiN) coating improves wear resistance and tool life over uncoated HSS
• High-speed steel construction handles a broad range of workpiece materials
• H1 thread limit for close-tolerance fits
• Plug chamfer provides reliable thread engagement and easy starting

Compatibility

Designed as a standard replacement or production spiral point tap for through-hole 1/4-28 UNF threading operations in general machining and maintenance applications.

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician familiar with tapping procedures. Always use appropriate cutting fluid for the workpiece material to extend tap life and improve thread quality. Ensure the tap is properly aligned with the hole axis before engagement to avoid tap breakage. Power down and lock out all equipment before performing any manual tapping or tap changeout on machine tools.