Emuge BU501000.5039 Spiral Flute Tap 6-40 Unf Cobalt

Product Description

The EMUGE BU501000.5039 is a spiral flute tap designed for blind hole threading in 6-40 UNF applications. It features three right-hand flutes with a 35-degree helix angle that evacuates chips up and out of the hole, reducing the risk of packing and tap breakage. The modified bottoming chamfer allows threading close to the bottom of a blind bore. Built from cobalt high-speed steel with a bright, uncoated finish, this tap is suited for use on non-ferrous metals and steel. Overall length is 2.205 inches with a thread length of 0.276 inches. It is installed by machinists and tool-and-die tradespeople in production and maintenance environments.

This tap is intended for blind hole threading in materials including non-ferrous metals and steel, where chip evacuation out of the hole is critical to thread quality and tool life. The 6-40 UNF thread form and 2B class of fit make it a standard choice for precision fastener applications in instrumentation, small mechanical assemblies, and similar close-tolerance work. It belongs to the EMUGE Enorm series, which is designed for consistent performance in repeatable tapping operations across manual and CNC-driven setups.

Key Features

• 6-40 UNF thread form with 2B class of fit for standard precision threading
• Modified bottoming chamfer for threading near the bottom of blind holes
• 35-degree right-hand helix evacuates chips away from the cutting edge in blind hole applications
• Cobalt HSS construction provides heat and wear resistance in steel and non-ferrous metals
• Bright, uncoated finish suitable for use with standard tapping fluids and cutting oils
• Medium flute style with three flutes balances chip room and tool strength at this diameter

Compatibility

Designed for blind hole threading in non-ferrous metal and steel workpieces requiring a 6-40 UNF, 2B class of fit thread. Part of the EMUGE Enorm series.

Installation Notes

This tap is installed by machinists using a tap wrench, tapping head, or CNC tapping cycle. Power down or disengage the spindle before loading the tap into the holder and confirm the shank is properly seated and secured. Use an appropriate tapping fluid or cutting oil for the workpiece material to extend tool life and improve thread finish. Follow applicable shop safety procedures and verify hole depth and diameter before tapping to avoid bottoming out the chamfer prematurely.