Value Collection JY9975566 Extension Tap 5/16-24 Hss

Product Description

The VALUE COLLECTION JY9975566 is a spiral point plug extension tap designed for cutting right-hand internal threads in a 5/16-24 UNF thread form. Built from high-speed steel (HSS), this tap handles the demands of production and repair threading in steel, cast iron, and similar materials. The spiral point geometry pushes chips forward ahead of the cut, making it well suited for threading through holes where chip evacuation is a priority. At 6 inches overall length (OAL), the extended reach allows threading in recessed bores or deep-set locations that standard-length taps cannot access. The H3 thread limit provides tight tolerance control appropriate for 3B class of fit applications.

This extension tap is used in machine shop, maintenance, and repair environments where standard tap length is insufficient for the job. Typical applications include threading deep bosses, recessed holes, or hard-to-reach locations on mechanical assemblies and structural components. The 5/16-24 UNF thread standard is common in precision fastener applications across automotive, aerospace, and general industrial work. The plug chamfer (3-5 thread taper) allows the tap to start easily and is appropriate for through-hole and most blind-hole applications where adequate depth is available.

Key Features

• Spiral point geometry pushes chips forward for clean through-hole threading
• 6-inch OAL provides extended reach for recessed or deep-set bore locations
• High-speed steel construction for durability across a wide range of workpiece materials
• H3 thread limit ensures consistent tolerance control for 3B class of fit
• Plug chamfer (3-5 threads) for easy starting in through holes and most blind holes
• Bright/uncoated finish suitable for use with cutting fluids across general-purpose applications

Compatibility

Designed as a direct-use tap for cutting 5/16-24 UNF right-hand internal threads in through-hole applications requiring extended reach. Fits standard tap holders and tapping heads sized for the corresponding shank diameter.

Installation Notes

This tap is installed and operated by machinists or maintenance technicians using a compatible tap wrench, tapping head, or CNC spindle. Always secure the workpiece firmly and use appropriate cutting fluid for the base material to extend tool life and improve thread quality. Back off periodically during hand tapping to break and clear chips. Do not force the tap if resistance increases unexpectedly, as this can cause breakage in the bore.