Eagle Cutting Tool HT-40000-8-P-I Hss Plug Tap 4 Inch 8 Tpi

Product Description

The EAGLE CUTTING TOOL HT-40000-8-P-I is a high-speed steel (HSS) plug tap designed for cutting internal threads in a 4-inch diameter at 8 threads per inch (TPI). The plug tap chamfer style — typically 3 to 5 threads of lead — makes it suitable for through-holes and deep blind holes where a starting chamfer is needed before a bottoming tap is run. HSS construction provides the toughness and heat resistance required for production and repair threading in ferrous metals and many non-ferrous materials. This is an import-grade tool suited for maintenance, repair, and fabrication shops that need reliable threading at a practical price point.

This tap is used in heavy-duty threading applications involving large-diameter fasteners, pipe flanges, structural components, and industrial machinery. The 4-inch-8 thread form follows the Unified National Coarse (UNC) standard, making it applicable in general industrial fabrication, equipment repair, and toolroom work. Installation is typically performed by machinists, millwrights, or experienced maintenance technicians working on manual or CNC lathes, mills, or large drill presses with appropriate tapping fixtures.

Key Features

• HSS construction for toughness and resistance to heat buildup during cutting
• Plug chamfer style suits both through-holes and deep blind-hole applications
• 4-inch-8 UNC thread form for large-diameter industrial fastener applications
• Import-grade pricing makes it practical for low-frequency or one-time use jobs
• Minimum order quantity of 1 — available as a single unit

Compatibility

Designed as an OEM-style replacement or maintenance tool for any application requiring a 4-inch-8 UNC internal thread in ferrous or non-ferrous base materials.

Installation Notes

This tap should be installed and operated by qualified machinists or maintenance professionals familiar with large-diameter tapping procedures. Always ensure the workpiece is securely fixtured and properly pilot-drilled to the correct tap drill diameter before beginning the threading operation. Use appropriate cutting fluid for the base material being threaded to extend tool life and improve thread finish. Follow applicable shop safety standards and machine guarding requirements when operating power tapping equipment.

Technical Specifications

• Thread Size: 4 inches
• Threads Per Inch (TPI): 8
• Tap Style: Plug
• Material: High-Speed Steel (HSS)
• Weight: 8.4 pounds
• Minimum Order Quantity: 1

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: HT-40000-8-P-I