Eagle Cutting Tool HT-27500-8-B-I 2-3/4 8 Hss Bottom Tap

Product Description

The EAGLE CUTTING TOOL HT-27500-8-B-I is a 2-3/4 inch, 8 threads-per-inch (TPI) high-speed steel (HSS) hand bottom tap designed for threading holes to the bottom of a blind bore. The bottom chamfer geometry — typically 1 to 2 threads of lead — allows the tap to cut threads as close to the bottom of a stopped hole as possible, making it essential when full thread depth is required throughout the full length of the hole. Machinists, tool-and-die makers, and maintenance mechanics reach for bottom taps during finishing passes after a taper or plug tap has established the thread. At 6.3 pounds, this is a large-diameter tap suited for heavy-duty threading operations.

This tap is applied in industrial, manufacturing, and maintenance environments where large-diameter internal threads are required in blind holes. Common applications include threading flanges, heavy machinery components, pipe fittings, structural fixtures, and large mechanical assemblies that call for a 2-3/4 inch, 8 TPI coarse unified thread form. The hand designation indicates it is driven manually with a tap wrench rather than by machine, giving the operator precise torque control when threading large-diameter holes by hand.

Key Features

• Bottom chamfer profile threads blind holes to near-full depth
• 2-3/4 inch diameter with 8 TPI coarse thread pitch
• High-speed steel (HSS) construction provides hardness and heat resistance for threading steel and ferrous materials
• Hand-drive design allows controlled torque application with a standard tap wrench
• Heavyweight build at 6.3 pounds suited for large-format industrial threading work

Compatibility

Designed as a hand bottom tap for use in manual threading of 2-3/4 inch, 8 TPI unified coarse (UNC) blind holes across compatible industrial and mechanical applications.

Installation Notes

This tap is installed by a machinist or maintenance mechanic using a properly sized tap wrench rated for large-diameter taps. Always ensure the workpiece is securely fixtured before beginning the threading operation, and use an appropriate cutting fluid for the material being tapped to reduce heat and extend tap life. A taper or plug tap should be used first to establish the thread before the bottom tap is used as a finishing pass. Back the tap out periodically to clear chips and prevent binding or breakage.

Technical Specifications

• Thread Diameter: 2-3/4 inches
• Threads Per Inch (TPI): 8
• Material: High-Speed Steel (HSS)
• Tap Style: Hand Bottom Tap
• Weight: 6.3 pounds
• Minimum Order Quantity: 1

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: HT-27500-8-B-I