Walter 4-40 NC HSS Bottoming Tap for Blind Holes

Reliable Taps for Tough Jobs

When you are deep in a repair job or finishing a custom fabrication piece, the last thing you need is a tap that dulls instantly or snaps off in the hole. The Walter 4-40 NC Bottoming Tap is built for the tradesperson who demands quality. Made from premium High-Speed Steel (HSS), this tap cuts cleaner and lasts longer than generic carbon steel alternatives. It bites into stainless steel, aluminum, and mild steel with confidence, giving you professional results every time you turn the wrench.

This is a bottoming tap, which means it is the specialist tool you need for blind holes. If you are drilling into a solid block or a casting where the hole doesn't go all the way through, a standard tap will leave unthreaded space at the bottom. This Walter tap features a short chamfer that allows you to thread all the way down, ensuring your bolts and screws have maximum holding power. It is the perfect finishing tool after you have started the thread with a taper or plug tap.

Walter tools are known for their durability, and this tap is no exception. It is hardened and tempered to resist breakage, a common frustration with smaller tap sizes like 4-40. Whether you are fixing a stripped thread on a machine guard, tapping a new hole for a bracket, or working on detailed assembly tasks, this tool provides the precision you need. Keep your toolbox stocked with high-quality cutters that save you time and frustration on the job site.

Why Choose HSS?

High-Speed Steel isn't just a fancy name; it means the tool can withstand higher temperatures without losing its cutting edge. For welders and fabricators working with tough alloys, HSS is essential. It ensures that the tap stays sharp through repeated use, reducing the force needed to cut threads and minimizing the risk of binding or breaking the tool in the workpiece.