Kennametal 5479704 Spiral Point Tap 5/16-24 Unf Hss-e Oxide

Product Description

The KENNAMETAL 5479704 is a spiral point tap designed for through-hole threading applications in ferrous and hard materials. Built from HSS-E (high-speed steel with cobalt) and finished with an oxide coating, this tap handles 5/16-24 UNF threads with a 3-flute, plug chamfer configuration to a 3B class of fit. The spiral point geometry pushes chips forward ahead of the cut rather than packing them in the flute, making it well suited for through-hole work where chip evacuation is critical. Overall length is 3.54 inches (90.00 mm) and thread length is 0.59 inches (14.99 mm). Weight is 0.0598 pounds. Right-hand thread direction. Part of the KENNAMETAL T820 series, material grade KSP39.

This tap is intended for through-hole threading in steel, stainless steel, and cast iron — materials common in manufacturing, MRO, and precision machining environments. The plug chamfer distributes cutting load across several lead threads, which is appropriate for starting in a pre-drilled through-hole. The 5/16-24 UNF thread form is widely used in fastener applications requiring fine-thread engagement. The HSS-E substrate provides increased toughness and heat resistance compared to standard HSS, extending tool life in interrupted or harder materials. This tap is used by machinists, tool and die makers, and maintenance technicians working in machine shops and industrial settings.

Key Features

• Spiral point geometry pushes chips forward for efficient through-hole chip evacuation
• HSS-E (cobalt high-speed steel) substrate for improved heat and wear resistance in tough materials
• Oxide coating reduces friction and provides basic corrosion protection during storage and use
• Plug chamfer distributes cutting load across multiple lead threads for smooth thread starts
• 3B class of fit delivers standard tolerance threading suitable for most general fastener applications
• Right-hand cut, no coolant-through — compatible with standard tapping setups

Compatibility

Designed for through-hole threading in steel, stainless steel, and cast iron. Material application data from KENNAMETAL specifies these three material categories as intended use cases for this tap. No specific machine or fixture compatibility is stated in available product data.

Installation Notes

This tap is installed by machinists or maintenance technicians using a tap wrench, tapping head, or CNC tapping attachment — ensure the spindle is stopped and the workpiece is secured before tool changes. Always pre-drill the correct tap drill size for 5/16-24 UNF threads before tapping and verify hole depth exceeds the required thread engagement length for through-hole applications. Use appropriate cutting fluid for the workpiece material, particularly when tapping stainless steel or cast iron. Do not exceed the tap's rated material hardness range, as HSS-E tools are not designed for hardened steel above approximately 35 HRC without coatings rated for that purpose — no hardness limit is specified in the available data, so consult KENNAMETAL documentation for precise application limits.