Eagle Cutting Tool HT-12500-8-P-I Hss Hand Plug Tap 1-1/4 8 Tpi

Product Description

The EAGLE CUTTING TOOL HT-12500-8-P-I is a high-speed steel (HSS) hand plug tap sized 1-1/4 inch diameter with 8 threads per inch (TPI). Plug taps feature a chamfer on the first 3 to 5 threads, making them the standard starting point for threading through holes or continuing threads in a blind hole after a taper tap has been used. This tap is designed for hand tapping operations and is suited for machinists, pipefitters, and maintenance technicians who need to cut or restore internal threads in ferrous and non-ferrous materials. The HSS construction provides adequate hardness and wear resistance for general-purpose threading tasks across a wide range of shop and field applications.

This tap is appropriate for threading operations in industrial maintenance, fabrication shops, and mechanical contracting environments. The 1-1/4 inch by 8 TPI thread form corresponds to the UNC (Unified National Coarse) standard, a commonly used thread specification in structural and heavy-duty fastening applications. It is suitable for use in mild steel, cast iron, aluminum, brass, and similar materials. Hand-tapping with this size typically requires a large tap wrench capable of handling the torque demands of a 1-1/4 inch tap.

Key Features

• 1-1/4 inch diameter, 8 TPI UNC thread form for heavy-duty hand tapping
• High-speed steel (HSS) construction for durability across general-purpose materials
• Plug chamfer (3-5 thread lead) suits both through-hole and blind-hole threading
• Designed for manual hand tapping with a tap wrench
• Import grade suitable for maintenance, repair, and lower-volume threading tasks

Compatibility

Designed as a general-purpose hand plug tap for use wherever a 1-1/4 inch by 8 TPI UNC internal thread is required; no specific equipment compatibility was stated by the manufacturer for this part.

Installation Notes

Hand plug taps of this size should be installed by a qualified machinist or maintenance technician familiar with tapping procedures for large-diameter threads. Always use cutting fluid appropriate for the workpiece material, and back the tap off a half turn periodically to break chips and prevent binding. Ensure the tap is started square to the workpiece to avoid cross-threading or tap breakage. Never apply excessive force; a large, properly sized tap wrench gives better control and reduces the risk of damage.

Technical Specifications

• Thread Size: 1-1/4 inch
• Threads Per Inch: 8 TPI
• Thread Standard: UNC (Unified National Coarse)
• Tap Type: Hand Plug
• Material: High-Speed Steel (HSS)
• Weight: 1.8 pounds
• Minimum Order Quantity: 1

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: HT-12500-8-P-I