Eagle Cutting Tool HT-5625-18-B-D 9/16-18 Hss Bottom Tap

Product Description

The EAGLE CUTTING TOOL HT-5625-18-B-D is a 9/16-18 high-speed steel (HSS) bottom tap designed for threading blind holes to the full depth of the bore. Bottom taps have minimal chamfer on the leading threads, allowing them to cut usable threads as close to the bottom of a stopped hole as possible. This tap is sized for the 9/16-18 UNF thread form, combining a medium-diameter shank with fine pitch for applications where thread strength and vibration resistance are priorities. Machinists, pipefitters, and maintenance technicians reach for bottom taps when a plug or taper tap has already started the thread and a complete thread depth is required.

This tap is suited for threading ferrous and non-ferrous metals in both job-shop and field-maintenance settings. Typical applications include threading blind holes in steel brackets, aluminum housings, and similar structural components. The 9/16-18 UNF specification is common in hydraulic fittings, automotive assemblies, and general mechanical fabrication where fine-thread engagement is specified. It is appropriate for use in manual tap handles or low-speed machine tapping operations.

Key Features

• Bottom-chamfer geometry cuts threads to the floor of blind holes
• 9/16-18 UNF thread form for fine-pitch, high-strength thread engagement
• High-speed steel construction provides heat and wear resistance during cutting
• Lightweight at 0.32 pounds, easy to handle in confined workspaces
• Minimum order quantity of 1, available as a single unit

Compatibility

Designed for use in any application requiring a 9/16-18 UNF bottom tap in high-speed steel, compatible with standard tap handles and tap wrenches sized for the corresponding square drive shank.

Installation Notes

Always secure the workpiece before tapping and use a cutting fluid appropriate for the material being threaded to extend tap life and improve thread quality. A plug or taper tap should be used first to start the thread in a blind hole before finishing with this bottom tap. Apply steady, even torque and back off periodically to break chips and prevent tap breakage. Follow applicable shop safety practices and wear appropriate eye protection during all tapping operations.

Technical Specifications

• Thread Size: 9/16-18 UNF
• Tap Type: Bottom
• Material: High-Speed Steel (HSS)
• Weight: 0.32 pounds

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: HT-5625-18-B-D