Eagle Cutting Tool HT-12500-7-B-I 1-1/4-7 Hss Hand Bottom Tap

Product Description

The EAGLE CUTTING TOOL HT-12500-7-B-I is a 1-1/4 inch-7 TPI high-speed steel (HSS) hand bottom tap designed for cutting full threads to the bottom of a blind hole. The bottom chamfer — typically 1 to 2 threads — allows thread cutting extremely close to the base of the hole, making it the preferred tap style when thread depth is limited. At 0.31 pounds, this is a hand-driven tool intended for use with a tap wrench rather than a machine spindle. Machinists, pipefitters, maintenance techs, and general fabricators reach for a bottom tap as the final step in a three-tap sequence or as a standalone tool in shallow blind-hole applications.

This tap is suited for threading 1-1/4 inch-7 UNC (Unified National Coarse) holes in ferrous and non-ferrous materials where a bottom tap is required to achieve full thread engagement near the base of a blind bore. Common applications include repair work, fixture fabrication, and production tapping in shops where hand tapping is standard practice. The 7 TPI pitch is the standard coarse-thread designation for 1-1/4 inch fastener work across industrial, structural, and mechanical maintenance settings.

Key Features

• 1-1/4 inch-7 UNC thread form for standard coarse-pitch applications
• High-speed steel (HSS) construction provides hardness and wear resistance for threading steel, cast iron, aluminum, and similar materials
• Bottom chamfer style allows threading to within 1-2 threads of the base of a blind hole
• Hand tap design — intended for tap wrench or hand-held driver use
• Lightweight at 0.31 pounds for easy single-hand control during tapping operations

Compatibility

Designed as a standard hand bottom tap for use in any application requiring 1-1/4 inch-7 UNC internal threads; compatible with standard 1-1/4 inch-7 tap wrenches and holders.

Installation Notes

Always secure the workpiece before tapping and use a quality cutting fluid or tapping compound appropriate for the material being threaded. Align the tap perpendicular to the work surface before applying torque to avoid tap breakage or cross-threading. When following a taper or plug tap in a blind hole sequence, clear chips frequently by backing off the tap every few turns. Broken taps in a blind hole are difficult to remove — use proper technique and do not force the tap if resistance increases suddenly.