03B142 - Walter 7/8 Inch 9 NC HSS Plug Tap

Precision Threading with Walter High-Speed Steel Taps

The Walter 7/8"-9 NC Plug Tap is a premium cutting tool engineered for industrial professionals who demand accuracy and longevity in their threading operations. Manufactured from top-tier High-Speed Steel (HSS), this tap is designed to withstand the high thermal stresses and abrasive forces encountered when cutting threads into metals ranging from soft aluminum to tough stainless steel. Unlike standard carbon steel taps, Walter's HSS composition ensures that the cutting edges remain sharp longer, reducing the frequency of tool changes and ensuring consistent thread quality over the lifespan of the tool.

This specific model features a "Plug" chamfer, which is the most commonly used style for general tapping applications. With a chamfer length of approximately 3 to 5 threads, it offers a balanced approach, allowing for easier starting than a bottoming tap while still being capable of threading relatively close to the bottom of a blind hole if necessary. However, it excels primarily in through-hole applications where the chips can be pushed forward or evacuated easily. The precision-ground threads are hardened and tempered to exacting standards, minimizing friction and torque requirements during the cut. This results in cleaner, more precise threads that meet strict tolerance requirements.

Whether you are manufacturing new components or repairing damaged threads in an MRO setting, the Walter 03B142 tap delivers reliable performance. Its robust construction minimizes the risk of breakage—a critical factor when working with expensive workpieces. Compatible with standard tap handles and suitable for both hand and machine tapping (depending on the setup), this tool is an essential addition to any machinist's or fabricator's toolkit. It is specifically optimized for National Coarse (NC) threads, providing the standard 9 threads per inch pitch required for 7/8" fasteners.