Eagle Cutting Tool HT-21250-8-T-I Hss Hand Taper Tap

Product Description

The EAGLE CUTTING TOOL HT-21250-8-T-I is a high-speed steel (HSS) hand taper tap designed to cut internal threads in a 2-1/8 inch diameter at 8 threads per inch (TPI). Taper taps feature a gradual thread lead — typically 8 to 10 chamfered threads — that distributes cutting load progressively, making them the standard starting tap for threading new holes by hand. Weighing 6.3 pounds, this is a heavy-duty tool suited for threading large-diameter holes in ferrous and non-ferrous metals. Machinists, pipefitters, and maintenance trades rely on this size for structural and mechanical threading applications where a full-size starting tap is required.

This tap is used in manual threading operations on large-diameter through-holes or blind holes where adequate clearance allows taper entry. Typical applications include structural steel fabrication, heavy equipment maintenance, and industrial repair work requiring 2-1/8 inch - 8 TPI UNC threads. The taper chamfer makes it well-suited as the first tap in a multi-tap sequence or as a standalone tap in through-hole applications. It is intended for hand-tapping with a standard tap wrench sized for large-shank tooling.

Key Features

• HSS construction provides hardness and wear resistance for threading steel, cast iron, and non-ferrous metals
• Taper chamfer distributes cutting load gradually for easier starting in new holes
• 2-1/8 inch nominal diameter at 8 TPI for large-diameter UNC thread applications
• Hand-tap geometry designed for use with a tap wrench in manual threading operations
• Weighs 6.3 pounds — heavy-duty build consistent with large-diameter cutting tool stock

Compatibility

Designed for manual threading of 2-1/8 inch - 8 TPI UNC threads in through-hole or blind-hole applications using a standard large-shank tap wrench.

Installation Notes

This tap is installed and operated by hand using a properly sized tap wrench — power driving is not recommended without appropriate speed control and is outside normal hand-tap use. Ensure the workpiece is securely fixtured before threading. Apply a suitable cutting fluid for the base material to reduce friction and extend tool life. Follow standard shop safety practices, including eye protection, when operating cutting tools.

Technical Specifications

• Thread Diameter: 2-1/8 inches
• Thread Pitch: 8 TPI
• Tap Type: Hand Taper
• Material: High-Speed Steel (HSS)
• Weight: 6.3 pounds

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: HT-21250-8-T-I