Hertel K008535AS25 Spiral Point Tap 1/2-20 Unf Tin

Product Description

The HERTEL K008535AS25 is a spiral point tap designed for cutting 1/2-20 UNF threads in through-hole applications. Manufactured from high-speed steel with a titanium nitride (TiN) coating, it delivers improved wear resistance and extended tool life compared to uncoated HSS taps. The plug chamfer provides a gradual lead-in for starting the tap square in the hole. Three flutes push chips forward ahead of the cutting edge, keeping the flutes clear during the cut. This tap is sized for a 0.367-inch shank diameter and carries an H1 thread limit, indicating tight tolerance control suited to precision thread work. It weighs 0.2 pounds.

This tap is intended for use in through-hole threading operations in ferrous and non-ferrous metals, plastics, and similar machinable materials. The spiral point geometry makes it particularly effective in CNC machining centers and drill presses where chip evacuation into the hole ahead of the tap is acceptable. The 1/2-20 UNF thread form and plug chamfer are standard in general industrial, automotive, and mechanical assembly applications. Machinists, toolroom technicians, and maintenance mechanics are the primary users. The TiN coating also reduces built-up edge when working with aluminum and mild steel.

Key Features

• 1/2-20 UNF thread form for fine-thread through-hole applications
• High-speed steel construction with TiN coating for extended tool life
• 3-flute spiral point design pushes chips forward, keeping flutes clear
• Plug chamfer for gradual lead-in and accurate starting
• H1 thread limit for tight, consistent tolerance control
• Right-hand cut, no coolant-through requirement

Compatibility

Designed as a standard replacement or production spiral point tap for 1/2-20 UNF through-hole threading operations. Compatible with tap holders and quick-change tapping heads accepting a 0.367-inch shank diameter.

Installation Notes

This tap is installed by machinists and toolroom technicians using standard tapping equipment. Ensure the workpiece is securely fixtured and the tap is properly aligned before beginning the threading operation. Use an appropriate cutting fluid for the workpiece material to reduce friction and extend tap life. Do not reverse the tap under power without confirming the machine or tapping head supports reversing cycles.