Eagle Cutting Tool HT-544-B-D 5-44 Hss Hand Bottom Tap

Product Description

The EAGLE CUTTING TOOL HT-544-B-D is a 5-44 thread hand bottom tap ground from high-speed steel (HSS) and manufactured in the USA. Bottom taps are designed to cut threads as close to the bottom of a blind hole as possible, making them the finishing step in a three-tap sequence or the primary tool when full thread depth in a stopped bore is required. At 0.04 pounds, this is a compact, precision-ground tap suited for fine-thread work in metal fabrication, maintenance, and repair applications. Machinists, tool-and-die workers, and maintenance technicians rely on this style of tap where a plug or taper tap cannot reach the required thread depth.

The HT-544-B-D is sized for the 5-44 UNF thread specification, a fine-thread series commonly used in small fastener applications including instrument assembly, electronics enclosures, and light mechanical assemblies. It is intended for hand tapping operations and is compatible with standard tap handles and T-handle wrenches sized for its shank. Its USA manufacture indicates compliance with ANSI tap geometry and thread-form standards, making it a direct fit for work to inch-series specifications.

Key Features

• 5-44 UNF thread form for fine-pitch small-diameter tapping
• Bottom tap geometry allows threading to the base of blind holes
• High-speed steel (HSS) construction for durability across a range of workpiece materials
• USA manufactured to ANSI inch-series tap standards
• Lightweight at 0.04 pounds for precise hand control

Compatibility

Designed for use with standard tap handles and T-handle wrenches sized to fit the shank of a 5-44 hand tap. Suitable for threading blind or through holes in ferrous and non-ferrous metals where a 5-44 UNF thread form is specified.

Installation Notes

Hand tapping should be performed by a machinist or qualified maintenance technician using a properly sized tap handle to avoid breakage. Always apply cutting fluid appropriate to the workpiece material and back the tap off periodically to clear chips, especially in blind holes. Ensure the tap is started perpendicular to the work surface. When finishing a blind hole with a bottom tap, use a taper and plug tap first to establish the thread before switching to the bottom tap for final depth.

Technical Specifications

• Thread Size: 5-44 UNF
• Tap Type: Hand Bottom Tap
• Material: High-Speed Steel (HSS)
• Country of Origin: USA
• Weight: 0.04 pounds

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: HT-544-B-D