Kennametal 5689818 Spiral Point Tap 1/4-20 Unc Hss-e

Product Description

The KENNAMETAL 5689818 is a spiral point tap designed for through-hole threading in non-ferrous metal workpieces. It cuts a 1/4-20 UNC right-hand thread to a 2B class of fit using a plug chamfer entry, making it suited for production and maintenance threading operations. The tap is manufactured from HSS-E (high-speed steel with cobalt) and carries a triple coating of TiN, CrC, and C for improved wear resistance and surface lubricity. Overall length is 3.15 inches (80.00 mm), thread length is 19/32 inch (0.590 inch), and the H5 thread limit ensures consistent tolerance control across multiple passes.

This tap is used in through-hole threading applications on non-ferrous metals such as aluminum, brass, and copper alloys. The spiral point geometry pushes chips forward ahead of the tap, keeping the flutes clear and reducing the risk of chip packing in production environments. It is appropriate for use in CNC machining centers, drill presses, and tapping heads where controlled feed and rotation can be maintained. With two flutes and a plug chamfer, it performs best in applications where the workpiece can accept chip ejection through the bottom of the hole.

Key Features

• Spiral point geometry pushes chips forward for clean through-hole threading
• HSS-E (cobalt-enhanced high-speed steel) base material for improved hardness and heat resistance
• Triple coating — TiN, CrC, and C — reduces friction and extends tool life in non-ferrous applications
• H5 thread limit provides tight tolerance control for 2B class of fit threads
• Plug chamfer (3-5 thread lead) allows easy starting and smooth cutting progression
• Right-hand cut, 1/4-20 UNC, compatible with standard 1/4-inch tap holders and chucks

Compatibility

Designed for through-hole threading of non-ferrous metals. Part of the KENNAMETAL T672 series. No specific machine model compatibility was provided by the manufacturer for this SKU.

Installation Notes

Install this tap in a rigid tapping holder or floating tap head suitable for 0.2550-inch shank diameter. Ensure the workpiece is securely fixtured and the pilot hole diameter is correct for a 1/4-20 UNC tap before beginning the threading cycle. Use an appropriate cutting fluid or tapping compound for non-ferrous metals to maintain coating effectiveness and surface finish. Inspect the tap for wear or chipping before each use and replace if thread quality degrades.