Emuge BU501000.5003 Spiral Flute Tap 4-40 Unc Cobalt

Product Description

The EMUGE BU501000.5003 is a spiral flute tap designed for blind hole threading in metalworking applications. It cuts a 4-40 UNC right-hand internal thread with a 2B class of fit, making it suitable for precision fastener applications where consistent thread form is required. The tap is manufactured from cobalt high-speed steel and carries a bright, uncoated finish. It features 2 flutes with a 35-degree helix angle and a medium flute style, which helps evacuate chips up and out of blind holes during cutting. Licensed HVAC techs, machinists, and maintenance professionals working with non-ferrous metals and steel will find this tap well-suited for production and repair work.

This tap is intended for blind hole threading in non-ferrous metals and steel. The modified bottoming chamfer allows threading closer to the bottom of a blind hole than a standard plug tap, making it a practical choice where thread engagement depth is constrained. The Enorm series designation indicates a design optimized for performance in demanding threading operations. It is appropriate for use in manual tapping, CNC machining centers, and tapping machines where controlled feed rate and proper alignment can be maintained.

Key Features

• 4-40 UNC thread form with 2B class of fit for standard precision thread tolerances
• Modified bottoming chamfer for threading near the base of blind holes
• Cobalt HSS construction for improved heat and wear resistance in steel and non-ferrous metals
• 35-degree right-hand helix angle promotes upward chip evacuation in blind holes
• 2-flute medium flute style balances chip room and tool strength at this small diameter
• Bright, uncoated finish suitable for use with cutting fluid across a range of workpiece materials

Compatibility

Designed for blind hole threading applications in non-ferrous metals and steel requiring a 4-40 UNC internal thread with a 2B class of fit.

Installation Notes

This tap should be installed and used by machinists or qualified tradespeople familiar with proper tapping procedures. Always ensure the workpiece is securely fixtured and the tap is properly aligned to the pilot hole before threading to avoid tap breakage at this small diameter. Use an appropriate cutting fluid for the workpiece material to reduce heat buildup and extend tool life. Do not exceed the recommended tapping depth of 0.709 inches as provided in the product specifications.