Eagle Cutting Tool HT-40000-8-T-I Hss Taper Tap 4in 8TPI

Product Description

The EAGLE CUTTING TOOL HT-40000-8-T-I is a high-speed steel (HSS) taper tap designed for cutting internal threads in a 4-inch diameter at 8 threads per inch (TPI). Taper taps feature a gradual lead that distributes cutting load across several threads, making them well suited for starting threads in through-holes or moderately tough materials. This tap is an import-grade tool commonly used by machinists, pipefitters, and maintenance trades when threading large-diameter holes in metal or similar materials where a full HSS taper profile is required.

This tap is applicable to large-diameter threading operations found in industrial maintenance, heavy fabrication, and mechanical repair scenarios. Its 4-inch by 8 TPI specification places it in the range of coarse unified national (UNC) thread standards commonly encountered in structural and heavy-duty mechanical assemblies. It is suited for use in machine shops, field maintenance environments, and fabrication settings where manual or machine tapping of oversized holes is required.

Key Features

• High-speed steel (HSS) construction provides good wear resistance and hardness for threading metal workpieces
• Taper lead design distributes cutting forces gradually, reducing the risk of tap breakage when starting a thread
• 4-inch diameter at 8 TPI addresses large-diameter threading requirements in heavy fabrication and industrial maintenance
• Minimum order quantity of 1 allows single-unit purchase for individual job or replacement needs

Compatibility

Designed as a standard taper tap for cutting 4-inch by 8 TPI internal threads consistent with coarse unified national thread form specifications. Verify thread form and tolerance requirements against job specifications before use.

Installation Notes

Taper taps of this size are typically operated by experienced machinists or maintenance trades using a large tap wrench, manual tapping arm, or machine tapping setup. Ensure the workpiece is securely fixtured and the tap is properly aligned with the pre-drilled hole before beginning the threading operation. Apply appropriate cutting fluid throughout the operation to reduce heat buildup and extend tool life. De-energize and lock out any powered equipment before performing threading operations on installed machinery.

Technical Specifications

• Thread Diameter: 4 inches
• Threads Per Inch (TPI): 8
• Tap Type: Taper
• 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-T-I