Value Collection -22442-8 Hand Sti Tap M8 X 1.25

Product Description

The VALUE COLLECTION -22442-8 is an M8 x 1.25 metric coarse hand STI tap designed for cutting Screw Thread Insert threads in metal workpieces. STI taps produce an oversized internal thread that accepts helical wire thread inserts, restoring stripped threads or providing stronger thread engagement in softer base materials. This tap features 4 flutes and a plug chamfer, making it suited for through-hole tapping applications. Constructed from high-speed steel with a bright finish, it delivers reliable cutting performance across a range of ferrous and non-ferrous materials. Overall length is 2-15/16 inches. Thread limit is D2, indicating the tolerance class for the cut thread.

This tap is used in maintenance, repair, and manufacturing environments where M8 x 1.25 STI threads are required. Common applications include restoring damaged threads in aluminum, cast iron, and steel components such as engine blocks, housings, and structural assemblies. A plug chamfer provides 3 to 5 leading threads of taper, making it appropriate for starting in a hole with clearance at the bottom or continuing through a workpiece. Machinists, tool-and-die workers, and maintenance technicians typically use this tap by hand with a tap wrench or in a low-speed machine setup.

Key Features

• M8 x 1.25 metric coarse thread size for standard STI insert applications
• D2 thread limit for consistent tolerance control on cut threads
• 4-flute design provides balanced cutting action and chip clearance
• Plug chamfer suitable for through-hole and open-bottom applications
• High-speed steel construction for durability across ferrous and non-ferrous materials
• Bright finish with no coating, allowing direct inspection of tool condition

Compatibility

Designed as a hand STI tap for use with standard M8 x 1.25 metric coarse helical wire thread inserts in through-hole tapping operations.

Installation Notes

This tap should be installed by a machinist or qualified technician using an appropriate tap wrench or tapping fixture. Before tapping, ensure the workpiece is securely clamped and the pilot hole has been drilled to the correct STI tap drill diameter for M8 x 1.25 inserts. Apply cutting fluid appropriate for the base material to extend tool life and improve thread quality. Back the tap out periodically to break and clear chips, especially when working in blind holes or tough materials.