Emuge BU446A00.5011 Thread Forming Tap 3/8-16 Unc Bottoming

Product Description

The EMUGE BU446A00.5011 is a bottoming-style thread forming tap designed for producing 3/8-16 UNC internal threads in blind hole applications. Manufactured from powdered metal high-speed steel (HSS-E-PM) and finished with a TiN-T26 coating, this tap is engineered for chipless thread forming in steel and stainless steel workpieces. The bottoming chamfer - 1.5 to 2 thread lead - allows threading to the bottom of blind holes where clearance is limited. With an overall length of 3.937 inches and a thread length of 0.630 inches, it fits standard tapping chucks for both manual and CNC operations. Coolant-through capability supports high-productivity tapping cycles.

This tap is suited for production and job-shop environments where threading into steel and stainless steel is a routine operation. The 2BX class of fit and H5 thread limit deliver a controlled interference fit, making it appropriate for applications requiring precise thread form without cutting chips. Blind hole threading in ferrous materials - including structural steel and austenitic stainless - is the primary use case. Both manual machinists and CNC operators working in metalworking, fabrication, and maintenance repair operations will find this tap applicable to their workflow.

Key Features

• Bottoming chamfer (1.5-2P) enables threading close to the bottom of blind holes
• Powdered metal HSS-E-PM construction provides superior wear resistance over conventional HSS
• TiN-T26 coating reduces friction and extends tool life in steel and stainless steel
• Coolant-through design supports high-speed tapping with internal coolant delivery
• 2BX class of fit with H5 thread limit for controlled interference thread forming
• Right-hand thread direction, 3/8-16 UNC form, chipless cold-forming process eliminates chip evacuation concerns in blind holes

Compatibility

Designed for blind hole thread forming in steel and stainless steel (material application codes P and M). Part of the EMUGE Series BU446A00, trade name InnoForm 2-VA/E-SN-IKZ-PM-TiN-T26. Suitable for use with standard tapping holders that accommodate a 0.381-inch shank diameter and a 0.286-inch square drive.

Installation Notes

Thread forming taps require a properly sized forming tap drill - consult the applicable forming tap drill chart for 3/8-16 UNC before drilling pilot holes, as the required hole diameter differs from a standard cut tap drill size. This tap is installed by machinists and tool-and-die professionals using tapping heads, CNC machining centers, or hand tap wrenches; always confirm machine spindle direction and coolant delivery before starting a cycle. Disengage all power to the machine and secure the workpiece before changing or inspecting the tap. Do not use this tap as a cutting tap - it is a cold-forming tool and is not designed to cut threads in pre-tapped or hardened holes.