Eagle Cutting Tool MT-390-300-B-I Hss Metric Bottom Tap

Product Description

The EAGLE CUTTING TOOL MT-390-300-B-I is an M39.0 x 3.00mm pitch high-speed steel (HSS) metric bottom tap designed for cutting full threads to the base of blind holes. The bottom chamfer — typically 1 to 2 threads — allows threading closer to the bottom of a hole than a taper or plug tap can reach. HSS construction provides the hardness and wear resistance needed for production threading in steel, cast iron, aluminum, and similar materials. This tap is suited for use by machinists, tool and die makers, and maintenance technicians working with metric-threaded fasteners in industrial and manufacturing environments.

The MT-390-300-B-I is used in applications where a fully threaded blind hole is required at M39.0 x 3.00mm specifications. This is a large-diameter metric tap, commonly found in heavy equipment, structural machinery, hydraulic systems, and industrial fabrication work. It is intended for use in manual tapping operations with a tap wrench or in machine tapping setups where the operator completes the thread run with a bottom tap after a taper or plug tap has established the thread path.

Key Features

• M39.0 x 3.00mm metric thread form for large-diameter blind-hole threading
• Bottom chamfer geometry threads to within 1-2 threads of hole bottom
• High-speed steel (HSS) construction for hardness and wear resistance
• Suitable for threading steel, cast iron, aluminum, and similar materials
• Minimum order quantity of 1 unit

Compatibility

Designed as a standard HSS metric bottom tap for use in any application requiring M39.0 x 3.00mm internal threads in blind or through holes.

Installation Notes

Bottom taps should be used after a taper or plug tap has already established the thread path in the hole. Ensure the workpiece is securely fixtured before tapping and use an appropriate cutting fluid to reduce heat and extend tool life. Always back the tap out periodically to clear chips, especially in blind holes. This tool should be operated by a qualified machinist or trained technician familiar with tapping procedures and cutting tool safety.

Technical Specifications

• Thread Size: M39.0 x 3.00mm
• Tap Type: Bottom
• Material: High-Speed Steel (HSS)
• Thread Standard: Metric
• Weight: 2.03 pounds

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: MT-390-300-B-I