Eagle Cutting Tool HT-1228-B-D 12-28 Hss Bottom Tap

Product Description

The EAGLE CUTTING TOOL HT-1228-B-D is a 12-28 thread hand tap ground from high-speed steel (HSS) and finished as a bottom tap, also called a plug-to-bottom or bottoming tap. It cuts full threads to the bottom of a blind hole, making it the correct choice when thread runout space is limited. At 0.08 pounds, it is a lightweight, precision tool suited for threading operations in metal, plastic, and similar materials. Machinists, pipefitters, and maintenance technicians reach for this tap when a standard taper or plug tap cannot complete the thread to the required depth.

This tap is intended for hand-tapping and machine-tapping applications where a 12-28 unified fine thread (UNF) is specified. The 12-28 designation indicates a No. 12 major diameter with 28 threads per inch, a common specification in instrument panels, light fixtures, electrical enclosures, and precision mechanical assemblies. It is manufactured in the USA, which is consistent with tight tolerance requirements found in aerospace, HVAC equipment, and industrial maintenance work.

Key Features

• Bottoming tap geometry cuts threads to the base of blind holes where clearance is minimal
• 12-28 UNF thread form for precision fastener applications
• High-speed steel (HSS) construction provides hardness and wear resistance for threading ferrous and non-ferrous metals
• USA manufactured for consistent dimensional tolerances
• Lightweight at 0.08 pounds for easy handling and portability

Compatibility

Designed as an OEM-style replacement or service tap for any application requiring a 12-28 unified fine thread bottoming tap in HSS.

Installation Notes

This tap is installed by a machinist or maintenance technician using a standard tap wrench or tapping head. Always secure the workpiece before beginning the threading operation, and use an appropriate cutting fluid to reduce friction and extend tool life. Apply steady, even torque and back off periodically to break chips, especially in blind holes. Inspect the tap for chipping or wear before each use and replace if cutting edges show damage.

Technical Specifications

• Thread Size: 12-28
• Thread Form: Unified Fine (UNF)
• Tap Type: Bottom (Bottoming)
• Material: High-Speed Steel (HSS)
• Weight: 0.08 pounds
• Country of Origin: USA

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: HT-1228-B-D