Eagle Cutting Tool HT-13750-12-P-I Hss Hand Plug Tap

Product Description

The EAGLE CUTTING TOOL HT-13750-12-P-I is a high-speed steel (HSS) hand plug tap sized for 1-3/8 inch diameter threads at 12 threads per inch (TPI). A plug tap carries a chamfer of roughly 3 to 5 threads, placing it between a taper and a bottoming tap in the standard tap progression. This chamfer length allows the tool to start cleanly in a drilled hole and cut full threads through most of the depth with moderate hand-tool torque. It is intended for manual threading operations using a tap handle or tap wrench and is not designed for machine-driven applications. Machinists, pipefitters, and maintenance technicians reach for this tap when threading new holes or chasing existing threads in ferrous and non-ferrous metals.

This tap is suited for through-hole and partial blind-hole threading in shop, field, and maintenance settings. Typical applications include threading bolt-clearance holes in structural steel, machinery frames, and heavy flanges where a 1-3/8 inch-12 UN thread is specified. The fine 12 TPI pitch provides greater thread engagement strength and finer adjustment compared to the coarse-pitch equivalent, making it a common choice in load-bearing and vibration-sensitive assemblies. The import designation indicates sourcing outside domestic manufacture, offering a cost-effective option for general-purpose threading tasks.

Key Features

• High-speed steel construction provides hardness and wear resistance for threading steel, iron, and aluminum
• Plug chamfer (approximately 3-5 threads) allows easy starting in pre-drilled through holes and shallow blind holes
• 1-3/8 inch diameter, 12 TPI fine-pitch thread form for high thread-engagement strength
• Designed for manual hand-tap use with a standard tap wrench or T-handle
• Minimum order quantity of 1, suitable for single-unit procurement

Compatibility

Designed as a standard hand plug tap for 1-3/8 inch-12 UNF thread form, compatible with matching standard tap wrenches and suitable for use in holes pre-drilled to the correct tap drill diameter for a 1-3/8-12 thread specification.

Installation Notes

A licensed machinist or qualified tradesperson should verify the correct tap drill size before drilling to ensure proper thread percentage and tool life. Secure the workpiece firmly and use a calibrated tap wrench to apply straight, aligned torque — misalignment is a leading cause of tap breakage on larger-diameter taps. Apply cutting fluid appropriate to the workpiece material throughout the threading operation. Back the tap out periodically to clear chips, especially in blind holes.

Technical Specifications

• Thread Size: 1-3/8 inches - 12 TPI
• Thread Pitch: 12 TPI (fine)
• Tap Type: Hand Plug Tap
• Material: High-Speed Steel (HSS)
• Weight: 0.31 pounds

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: HT-13750-12-P-I