Kennametal 5416853 Spiral Point Tap 1/4-20 Unc Hss-e

Product Description

The KENNAMETAL 5416853 is a spiral point tap designed for through-hole threading in 1/4-20 UNC applications. It features a 3-flute geometry with a plug chamfer that pushes chips ahead of the cutting edge, keeping the flutes clear during production runs. Built from High-Speed Steel-E (HSS-E), the tap carries a multilayer TiN, CrC, and C coating for improved wear resistance and lubricity. The H3 thread limit and 3B class of fit make it suitable for standard tolerance internal threads. Overall length is 2.5 inches, with a thread length of 0.63 inches. Machinists and tool-and-die technicians use this tap in manual, CNC, and tapping machine setups.

This tap is rated for through-hole threading in stainless steel and non-ferrous metals, making it a solid choice for shops working with 304 or 316 stainless, aluminum, brass, and similar materials. The spiral point style is best suited for through-holes where chips can exit forward without packing. It is not designed for blind-hole applications. The T820 series designation places it within Kennametal's line of precision-ground HSS-E taps intended for consistent thread quality in medium to high production environments.

Key Features

• Spiral point geometry pushes chips forward, ideal for through-hole threading
• HSS-E base material provides toughness in stainless steel and non-ferrous applications
• Multilayer TiN, CrC, and C coating reduces friction and extends tool life
• H3 thread limit with 3B class of fit for standard tolerance internal threads
• Right-hand cut, no coolant-through requirement, non-interrupted thread profile
• Plug chamfer for general-purpose through-hole starting and threading

Compatibility

Designed for through-hole threading operations in stainless steel and non-ferrous metals. Compatible with manual tapping handles, CNC machining centers, and dedicated tapping machines set up for 1/4-20 UNC right-hand threading.

Installation Notes

This tap is installed by machinists and CNC operators. Ensure the workpiece is securely fixtured and the spindle or tap holder is properly aligned before engaging the cut. Apply appropriate cutting fluid for the workpiece material, particularly when threading stainless steel, to reduce heat buildup and galling. Inspect the tap for wear or chipping before each use and replace if thread quality degrades.