Eagle Cutting Tool HT-13750-8-P-D 1-3/8-8 Hss Hand Plug Tap

Product Description

The EAGLE CUTTING TOOL HT-13750-8-P-D is a 1-3/8 inch diameter, 8 threads-per-inch (TPI) high-speed steel (HSS) hand plug tap manufactured in the USA. Plug taps feature a chamfer on the first 3 to 5 threads, making them the standard starting tap for most through-hole and blind-hole threading applications. This tap cuts internal threads by hand using a tap wrench or adjustable tap handle. Machinists, pipefitters, millwrights, and maintenance technicians reach for this size when threading large-diameter fastener holes in steel, cast iron, and similar ferrous materials.

The HT-13750-8-P-D is suited for industrial maintenance, fabrication shops, and field repair work where 1-3/8 inch-8 UNC threads are required. Common applications include threading holes for large structural bolts, tie rods, and heavy equipment fasteners. The plug chamfer geometry works in both through-holes and sufficiently deep blind holes, making it a versatile choice for general-purpose threading tasks across manufacturing and mechanical trade environments.

Key Features

• 1-3/8 inch diameter, 8 TPI UNC thread form for large-diameter fastener applications
• High-speed steel (HSS) construction provides heat resistance and edge retention during hand tapping
• Plug chamfer (3-5 thread lead) supports use in through-holes and deep blind holes
• USA manufactured for consistent dimensional accuracy and thread quality
• Compatible with standard tap wrenches sized for large-shank taps

Compatibility

Designed as a hand plug tap for cutting 1-3/8 inch-8 UNC internal threads in ferrous and non-ferrous materials where hand tapping is the specified method.

Installation Notes

This tap is intended for use by qualified machinists or tradespeople familiar with hand tapping procedures. Always secure the workpiece before tapping and use an appropriate cutting fluid to extend tool life and improve thread finish. Start the tap square to the hole to avoid cross-threading or tap breakage. Back the tap off periodically to break chips, particularly in blind holes.

Technical Specifications

• Thread Diameter: 1-3/8 inches
• Thread Pitch: 8 TPI
• Tap Type: Hand Plug
• Material: High-Speed Steel (HSS)
• Country of Origin: USA
• Weight: 1.78 pounds

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: HT-13750-8-P-D