Hertel K008118AS25 Spiral Point Tap 5-40 Unc Tin Hss

Product Description

The HERTEL K008118AS25 is a spiral point tap designed for cutting internal threads in through-hole applications. Built from high speed steel (HSS) with a titanium nitride (TiN) coating, this tap offers improved wear resistance and longer tool life compared to uncoated HSS taps. It cuts a 5-40 UNC thread profile with a plug chamfer and features 2 flutes with a right-hand thread direction. The H1 thread limit provides close tolerance control for precision threading work. Machinists and tool-and-die professionals install this tap in CNC machining centers, drill presses, and manual tapping operations where through-hole threading is required.

This tap is suited for threading through-holes in a range of materials including mild steel, aluminum, and similar metals where the spiral point geometry pushes chips ahead of the cutting edge. The 5-40 UNC size is commonly used in light fastener applications, electronics assemblies, and instrument manufacturing. The plug chamfer makes it appropriate for starting a thread from the top of a through-hole without requiring a bottoming tap. It is packaged and sold individually.

Key Features

• 5-40 UNC thread form for standard unified coarse through-hole threading
• Plug chamfer for straightforward through-hole entry and thread starting
• 2-flute spiral point geometry pushes chips forward and out of the hole
• TiN coating increases surface hardness and reduces tool wear
• H1 thread limit for close tolerance thread production
• Right-hand thread direction, no coolant-through required

Compatibility

Designed as an OEM-style replacement or direct-use tap for machine and hand tapping operations requiring a 5-40 UNC plug tap in high speed steel.

Installation Notes

This tap is installed by machinists using standard tap holders, tapping chucks, or floating tap adapters on manual or CNC equipment. Ensure the workpiece is securely fixtured before beginning the threading operation. Use an appropriate cutting fluid for the workpiece material to extend tap life and improve thread finish. Inspect the tap for wear or chipping before each use and replace if damaged to avoid broken tap removal.