Eagle Cutting Tool HT-11250-8-B-I Hand Bottom Tap Hss

Product Description

The EAGLE CUTTING TOOL HT-11250-8-B-I is a hand bottom tap ground from high-speed steel (HSS) for cutting internal threads in through-holes and blind holes where full threads must extend close to the bottom. Sized at 1-1/8 inch diameter with 8 threads per inch (TPI), this tap produces Unified National Coarse (UNC) threads suited to heavy fastener applications. The bottom chamfer — typically 1 to 2 threads — allows the tap to reach near the base of a blind hole, making it the finishing tap of choice after a taper or plug tap has begun the thread. Licensed machinists, pipefitters, and maintenance mechanics reach for this tool when thread depth and proximity to the bottom of a hole are critical requirements.

This tap is intended for hand tapping operations in metal fabrication, maintenance, and repair work. The 1-1/8 inch-8 thread form is common in heavy industrial fastener applications including large structural assemblies, machinery bases, and equipment frames where high clamping loads demand coarse, robust thread engagement. It is appropriate for use in steel, cast iron, aluminum, and similar materials when the correct cutting fluid is applied. The import designation indicates offshore manufacture, making this tap a cost-effective option for lower-volume or general maintenance use rather than high-production machining environments.

Key Features

• Bottom chamfer geometry allows threading close to the base of blind holes
• 1-1/8 inch diameter, 8 TPI UNC thread form for heavy industrial fastener applications
• High-speed steel (HSS) construction provides wear resistance across common ferrous and non-ferrous materials
• Designed for hand tapping with a tap wrench — not intended for machine tapping
• Minimum order quantity of 1 unit, suitable for single-trade or maintenance shop procurement

Compatibility

Designed as a standard hand bottom tap for use wherever 1-1/8 inch-8 UNC internal threads are required in through-holes or blind holes. Consult thread standard references to confirm fitment with mating fasteners before tapping.

Installation Notes

This tap should be installed using a properly sized tap wrench sized for the square drive shank. Secure the workpiece firmly before tapping and apply an appropriate cutting fluid to reduce heat and extend tool life. When tapping blind holes, back the tap out periodically to clear chips and prevent binding or breakage. Always wear eye protection when performing tapping operations.

Technical Specifications

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

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: HT-11250-8-B-I