Eagle Cutting Tool HT-13750-8-T-D 1-3/8 8 Tpi Hss Taper Tap

Product Description

The EAGLE CUTTING TOOL HT-13750-8-T-D is a 1-3/8 inch diameter, 8 threads-per-inch (TPI) high-speed steel (HSS) hand taper tap manufactured in the USA. It is designed to cut internal threads in through-holes and blind holes where a gradual thread lead-in is required. The taper chamfer distributes cutting load across the first several threads, making entry easier and reducing tool stress in harder materials. Machinists, pipefitters, millwrights, and maintenance technicians use this tap for threading operations in metal fabrication, mechanical assembly, and industrial maintenance applications.

This tap is suited for use in ferrous and non-ferrous metals including steel, cast iron, brass, and aluminum where a 1-3/8 inch-8 UNC thread form is specified. It is typically applied in heavy industrial fastening, structural fabrication, and equipment repair where large-diameter coarse-thread fasteners are required. The hand-tap designation means it is driven by a tap wrench or tapping fixture rather than by a machine spindle. It is appropriate for low-volume or hand-threading operations on the shop floor or in the field.

Key Features

• 1-3/8 inch diameter with 8 TPI UNC coarse thread form
• High-speed steel (HSS) construction for durability across a range of metals
• Taper chamfer distributes cutting force for easier thread initiation
• Hand-tap configuration compatible with standard tap wrenches and fixtures
• USA manufactured

Compatibility

Designed as a hand taper tap for cutting 1-3/8 inch-8 UNC internal threads in ferrous and non-ferrous metals using a standard tap wrench or tapping fixture.

Installation Notes

This tap should be installed and driven by a qualified machinist or tradesperson using an appropriately sized tap wrench. Ensure the workpiece is securely clamped and that the correct drill size for a 1-3/8 inch-8 UNC thread has been used prior to tapping. Apply cutting fluid throughout the operation to extend tool life and improve thread quality. Back the tap out periodically to clear chips and prevent binding or breakage.

Technical Specifications

• Thread Size: 1-3/8 inch
• Threads Per Inch: 8 TPI
• Thread Form: UNC Coarse
• Tap Type: Hand Taper
• Material: High-Speed Steel (HSS)
• Weight: 1.78 pounds
• Country of Origin: USA

Standard Information

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