Emuge BU206511.5043 Spiral Point Tap 1/4-28 Unf Hss-e Nt

Product Description

The EMUGE BU206511.5043 is a spiral point tap designed for through-hole threading in demanding materials. Built from HSS-E cobalt high-speed steel and finished with an NT coating, it handles stainless steel, non-ferrous metals, superalloys, and titanium where standard taps fall short. The 1/4-28 UNF thread form with a plug chamfer provides a gradual lead-in suited to production threading. Three flutes and a spiral point geometry push chips forward through the hole, keeping the flutes clear during the cut. Overall length is 3.15 inches with a thread length of 0.669 inches. Class of fit is 3BX for close-tolerance fastener applications. This tap is installed by machinists and toolroom technicians in CNC machining centers, drill presses, and manual tapping setups.

This tap is suited for through-hole threading operations in materials that accelerate tool wear, including austenitic stainless steels, titanium alloys, and superalloys. The HSS-E cobalt matrix improves heat and wear resistance compared to standard HSS, making it a practical choice for aerospace, medical device, and industrial fabrication work. The right-hand thread direction and 28 threads per inch pitch are standard for 1/4-28 UNF fastener applications in precision assemblies. Coolant-through capability is not included; flood or mist coolant applied externally is recommended when tapping these material types.

Key Features

• HSS-E cobalt construction for improved wear resistance in stainless steel, superalloys, and titanium
• NT coating reduces friction and extends tool life in difficult-to-machine materials
• Spiral point geometry pushes chips forward, keeping flutes clear in through-hole applications
• Plug chamfer provides gradual thread engagement for production and CNC tapping
• 3BX class of fit delivers close-tolerance threads for precision fastener assemblies
• Right-hand, 1/4-28 UNF thread form for standard inch-series fastener work

Compatibility

Designed for through-hole threading of 1/4-28 UNF threads in stainless steel, non-ferrous metals, superalloys, and titanium. Part of the EMUGE BU206511 series.

Installation Notes

Installation is performed by qualified machinists. Ensure the workpiece is securely clamped and the spindle is properly aligned before tapping to avoid tap breakage. Power down or disengage the machine before changing tooling. Use appropriate cutting fluid or external coolant for the workpiece material; dry tapping in stainless steel or titanium significantly reduces tool life and thread quality.