Eagle Cutting Tool HT-12500-8-B-I Hss Hand Bottom Tap

Product Description

The EAGLE CUTTING TOOL HT-12500-8-B-I is a high-speed steel (HSS) hand bottom tap sized 1-1/4 inch diameter with 8 threads per inch (TPI), designed for threading operations that require cutting full threads to the bottom of a blind hole. Bottom taps have a chamfer of 1-2 threads, allowing thread engagement as close to the bottom of a bore as possible. This tap is import-grade tooling suited for machine shops, maintenance facilities, and trade professionals who need a reliable bottom tap for general-purpose threading applications in steel, cast iron, aluminum, and similar materials.

This tap is commonly used in metalworking and mechanical maintenance applications where blind-hole threading is required and a plug or taper tap alone cannot complete the full thread depth. Typical users include machinists, pipefitters, millwrights, and industrial maintenance technicians. The 1-1/4 inch by 8 TPI thread form is frequently encountered in heavy equipment, structural fastening, and industrial fabrication work.

Key Features

• Bottom tap geometry with 1-2 thread chamfer for threading to the base of blind holes
• High-speed steel (HSS) construction for durability across a range of workpiece materials
• 1-1/4 inch diameter by 8 TPI thread form for large-fastener applications
• Hand tap design intended for use with a tap wrench or comparable hand-drive tooling
• Import-grade option for cost-effective general maintenance and production use

Compatibility

Designed as a general-purpose bottom hand tap for 1-1/4 inch by 8 TPI threaded applications in blind-hole metalworking operations.

Installation Notes

Bottom taps are typically the final tap used in a three-tap sequence, following a taper tap and a plug tap to clear and form initial threads. Secure the workpiece firmly before tapping, and use appropriate cutting fluid to extend tool life and improve thread quality. Apply consistent, even torque with a tap wrench and back off periodically to break chips and prevent tap breakage. Follow applicable shop safety standards when performing threading operations.

Technical Specifications

• Thread Size: 1-1/4 inch
• Threads Per Inch: 8 TPI
• Tap Type: Hand Bottom Tap
• Material: High-Speed Steel (HSS)
• Weight: 1.8 pounds

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: HT-12500-8-B-I