Walter 12-24 NC HSS Bottoming Tap

High-Performance 12-24 NC Bottoming Tap for Blind Holes

Achieve superior threading results with the Walter 12-24 NC Bottoming Tap, designed for the rigorous demands of professional metalworkers and welders. When working with blind holes, standard taper taps leave a significant portion of the hole unthreaded due to their long chamfer. The Walter Bottoming Tap solves this problem with a minimal chamfer of just 1-2 threads, allowing you to machine threads all the way to the bottom of the drilled hole. This capability is essential for applications where space is limited and maximum thread engagement is necessary for structural integrity.

Constructed from premium High Speed Steel (HSS), this tap is built to withstand the heat and stress of cutting metal. HSS is significantly more durable than carbon steel, making this tool an excellent choice for harder alloys, including stainless steel, as well as softer metals like aluminum and mild steel. The precision-ground flutes are designed to effectively evacuate chips, preventing clogging and reducing the risk of tap breakage—a common issue when tapping deep or blind holes.

For the best results, it is recommended to use this bottoming tap after initially starting the thread with a taper or plug tap, especially in harder materials. This ensures the tap enters the hole straight and reduces the torque load on the tool. However, in softer materials or for thread chasing (cleaning existing threads), it can often be used directly. Pair this tool with high-quality cutting fluid or tapping paste to further extend its life and ensure a smooth, clean thread finish every time.

Technical Excellence

Walter Surface Technologies is renowned for producing tools that improve productivity and safety. The 03A123 tap exemplifies this with its consistent quality control. The 12-24 National Coarse (NC) thread profile is machined to exact specifications, ensuring compatibility with standard 12-24 fasteners. Whether you are fabricating custom brackets, repairing engine components, or performing general metalwork, this HSS bottoming tap provides the reliability and precision you need to get the job done right.