Eagle Cutting Tool MT-390-400-P-I M39.0x4.00 Hss Plug Tap

Product Description

The EAGLE CUTTING TOOL MT-390-400-P-I is a high-speed steel (HSS) metric plug tap designed to cut M39.0x4.00 internal threads. The plug tap chamfer — typically 3 to 5 threads — makes it suitable for through-hole and moderately deep blind-hole threading applications where a starting chamfer aids alignment and reduces initial cutting load. Machinists, pipefitters, and maintenance technicians use this tap when threading large-diameter metric fastener holes in ferrous and non-ferrous materials. At 2.03 pounds, the tool has the mass consistent with a large-diameter hand or machine tap intended for heavy-duty threading work.

This tap is used in industrial, manufacturing, and maintenance-repair-operations (MRO) settings where M39 metric threads are specified. Typical applications include heavy machinery frames, structural assemblies, flanges, and large equipment housings that require M39 coarse-pitch threaded holes. It can be driven by hand with a suitable tap wrench sized for the tap's square shank, or run at low speed on a drill press or milling machine with proper tapping fluid and chip-clearing technique.

Key Features

• M39.0x4.00 metric coarse thread form for large-diameter internal threading
• High-speed steel (HSS) construction provides hardness and wear resistance across a range of workpiece materials
• Plug chamfer (approximately 3-5 threads) aids starting alignment in through-holes and moderate blind-hole depths
• Compatible with hand tapping and low-speed machine tapping setups
• Minimum order quantity of 1 — available as a single unit

Compatibility

Designed as an OEM-style replacement or standard toolroom tap for applications requiring M39.0x4.00 metric coarse internal threads per ISO metric thread standards.

Installation Notes

Threading operations with large-diameter taps should be performed by qualified machinists or maintenance technicians familiar with proper tapping technique. Always apply cutting fluid appropriate for the workpiece material and clear chips frequently to prevent tap breakage. Secure the workpiece firmly and ensure the tap is started square to the hole to avoid thread damage or tool failure. Power down and de-energize any machine tool before mounting or removing the tap from the chuck or holder.

Technical Specifications

• Thread Size: M39.0x4.00 metric coarse
• Tap Type: Plug
• Material: High-Speed Steel (HSS)
• Weight: 2.03 pounds
• Minimum Order Quantity: 1

Standard Information

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