Value Collection JY9975673 Extension Tap 3/8-24 Unf

Product Description

The VALUE COLLECTION JY9975673 is a spiral point plug extension tap designed for cutting right-hand internal threads in through-hole applications. It is ground to a 3/8-24 UNF thread form with an H3 thread limit, which controls tolerance for a precise 3B class of fit. The tap is manufactured from high-speed steel and features a bright, uncoated finish for general-purpose use. With three flutes and a spiral point geometry, it pushes chips forward through the hole rather than backing them out, keeping the cutting zone clear. Overall length is 6 inches, giving extended reach in deep-set or obstructed workpieces. Machinists and maintenance technicians use this tap in production and repair environments where standard-length taps cannot access the thread location.

This extension tap is suited for threading through holes in steel, aluminum, brass, and similar machinable materials. The plug chamfer — typically 3 to 5 threads of lead — makes it appropriate for starting in a pre-drilled hole and cutting to near full depth. It is commonly used in machine shops, maintenance facilities, and fabrication environments where 3/8-24 UNF fastener threads must be cut with extended reach. The 3B class of fit is the standard tolerance class for most general-purpose UNF threaded assemblies.

Key Features

• Spiral point geometry pushes chips forward, reducing clogging in through-hole threading
• H3 thread limit provides controlled tolerance for a 3B class of fit
• High-speed steel construction handles a broad range of machinable metals
• Plug chamfer with 3 to 5 thread lead for standard through-hole starts
• 6-inch overall length provides extended reach in deep or obstructed bores
• Bright, uncoated finish suited for general-purpose and lower-volume threading operations

Compatibility

Designed as a direct-use tap for cutting 3/8-24 UNF right-hand internal threads in through-hole workpieces requiring extended tool reach and a 3B class of fit.

Installation Notes

Use in a tapping head, drill press, or CNC machine with appropriate tapping fluid for the workpiece material. Ensure the pilot hole is drilled to the correct tap drill size for 3/8-24 UNF before threading. Power down and secure the workpiece before tool changes. Do not apply excessive axial force — allow the spiral point geometry to advance the tap naturally to avoid flute breakage.