Eagle Cutting Tool MT-390-400-T-I Hss Metric Taper Tap

Product Description

The EAGLE CUTTING TOOL MT-390-400-T-I is a high-speed steel (HSS) metric taper tap designed to cut internal threads in metal workpieces. It is sized for an M39.0 thread diameter with a 4.00 mm pitch, making it suitable for large-diameter threading applications in manufacturing, industrial maintenance, and heavy fabrication environments. The taper lead allows gradual thread engagement, which reduces cutting force and helps align the tap squarely in the hole. Machinists, millwrights, and maintenance mechanics are the primary users of this tool.

This tap is applied wherever M39.0x4.00 metric threads need to be cut by hand or with a tapping fixture. Typical applications include fabricating threaded holes in steel plate, cast iron, and similar ferrous materials used in industrial equipment and structural assemblies. The taper style is especially useful when starting threads in a new, unthreaded hole where a gradual entry is preferred over a bottoming or plug profile.

Key Features

• M39.0x4.00 metric thread form for large-diameter internal threading
• High-speed steel (HSS) construction provides wear resistance and durability in ferrous materials
• Taper lead design eases thread entry and promotes straight alignment during cutting
• Import-grade tooling suited for maintenance, repair, and lower-volume production applications

Compatibility

Designed as a standard M39.0x4.00 metric taper tap for use with compatible tap wrenches, T-handles, or tapping fixtures that accommodate large-diameter taps.

Installation Notes

This tap should be installed and operated by a qualified machinist or maintenance mechanic familiar with threading operations. Before tapping, ensure the workpiece is securely clamped and that the pilot hole is drilled to the correct tap drill diameter for an M39.0x4.00 thread. Use appropriate cutting fluid throughout the operation to reduce heat and extend tool life. Never force the tap if resistance increases sharply, as this risks tool breakage in the hole.

Technical Specifications

• Thread Size: M39.0
• Thread Pitch: 4.00 mm
• Thread Form: Metric
• Tap Style: Taper
• Material: High-Speed Steel (HSS)
• Weight: 2.03 pounds

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: MT-390-400-T-I