Value Collection JY9975665 Extension Tap 3/8-16 Unc Hss

Product Description

The VALUE COLLECTION JY9975665 is a spiral point plug extension tap designed for cutting unified coarse (UNC) internal threads at a 3/8-16 thread size. Built from high-speed steel (HSS), it delivers the hardness and heat resistance needed for production tapping in ferrous and non-ferrous metals. The spiral point geometry pushes chips forward ahead of the cutting teeth, keeping flutes clear and reducing the chance of chip packing in through-hole applications. At 6 inches overall length (OAL), this tap reaches into recessed bosses, deep fixtures, or obstructed setups where a standard-length tap cannot gain access. Machinists, toolmakers, and maintenance technicians in metalworking shops are the primary users.

This tap is suited for through-hole tapping operations in materials such as mild steel, aluminum, and similar machinable metals. Its extended OAL makes it a practical choice for production machining, CNC tapping centers, and manual drill press work where clearance is limited. The H3 thread limit provides a controlled fit tolerance appropriate for general-purpose 3B class fits, making it compatible with standard 3/8-16 fastener assemblies used across industrial, manufacturing, and maintenance-repair-overhaul (MRO) environments.

Key Features

• Spiral point geometry pushes chips forward, ideal for through-hole applications
• High-speed steel construction for durability in ferrous and non-ferrous metals
• H3 thread limit for controlled tolerance on 3B class of fit threads
• 6 inch OAL extends reach into recessed or obstructed work areas
• Plug chamfer (3-5 thread lead) for easy starting and general-purpose tapping
• 3 flute design balances chip clearance and cutting edge strength

Compatibility

Designed for cutting 3/8-16 UNC internal threads to a 3B class of fit in through-hole applications across standard metalworking and MRO operations.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Ensure the workpiece is securely fixtured and properly center-drilled before tapping. Use an appropriate cutting fluid for the workpiece material to extend tap life and improve thread finish. Never reverse-cycle a spiral point tap in a CNC tapping center without confirming the machine supports synchronized tapping.