Walter 7/8-14 NF HSS Bottoming Tap for Blind Holes

Professional Grade Threading for Fabrication

In the world of welding and metal fabrication, precision is just as important as strength. The Walter 7/8-14 NF Bottoming Tap (SKU: 03B146) is the professional fabricator's choice for creating clean, accurate threads in blind holes. When you are fabricating custom parts, repairing heavy equipment, or tapping holes in thick plates where the hole doesn't go all the way through, a standard tap simply won't cut it. You need a bottoming tap to ensure the threads extend as deep as possible, allowing bolts and studs to seat fully and securely.

Constructed from superior High-Speed Steel (HSS), this tap is built to cut through tough materials commonly found in welding shops, including stainless steel and structural mild steel. The HSS material resists the heat generated during the cutting process, preventing the teeth from softening or dulling prematurely. This means you spend less time replacing tools and more time working. The tap features a 7/8-inch diameter with 14 threads per inch (National Fine), a configuration often used in automotive and precision machinery applications where vibration resistance and high strength are required.

The defining feature of this tap is its bottoming chamfer. With only 1.5 to 2 threads of taper at the tip, it begins cutting full threads almost immediately. This is indispensable when you need to maximize thread depth in a blind hole to ensure a strong connection. While taper taps are great for starting holes, they leave a significant portion of the hole unthreaded at the bottom. The Walter bottoming tap solves this problem, acting as the perfect finishing tool to complete the threading process.

Walter Surface Technologies is known for producing high-performance metalworking solutions, and this tap is no exception. The threads are precision-ground, not just cut, which provides a smoother finish and reduces the effort required to turn the tap. Whether you are tapping by hand with a tap wrench or using a machine setup, this tool provides the feedback and control necessary for high-quality results. Pair it with a quality tapping fluid like Walter's own coolants to ensure the smoothest cut and longest tool life possible.