03A053 - Walter 5-40 NC HSS Bottoming Tap for Blind Holes

Precision Threading with Walter High Speed Steel Taps

The Walter 03A053 5-40 NC Bottoming Tap is a premium-grade threading tool engineered for industrial maintenance, repair, and fabrication applications. Manufactured from top-quality High Speed Steel (HSS), this tap is designed to withstand the rigors of cutting threads into hard metals while maintaining a sharp cutting edge longer than traditional carbon steel alternatives. The HSS composition is hardened and tempered to provide the optimal balance of hardness and toughness, reducing the risk of snap-off during operation.

This specific model features a "Bottoming" chamfer, characterized by a very short lead of only 1 to 2 threads. This geometry is critical for threading blind holes—holes that do not pass completely through the workpiece. The bottoming style allows the user to cut full threads virtually to the bottom of the hole, maximizing the grip length for fasteners. It is typically used as the final step in a three-tap sequence (taper, plug, bottoming) or used cautiously on its own in softer materials or shallow holes.

Walter's commitment to precision is evident in the ground threads of this tool. Unlike cut threads, ground threads offer superior accuracy and surface finish, ensuring that the resulting internal threads meet strict tolerance classes. This results in a smoother assembly process and a stronger mechanical connection. The tap is versatile enough to handle a wide range of materials, including aluminum, mild steel, and stainless steel, making it an indispensable tool for machine shops and MRO tool cribs.

Whether you are repairing damaged threads in a critical component or fabricating new parts, the Walter 5-40 NC Bottoming Tap delivers the reliability and performance professionals demand. Its free-cutting action reduces torque requirements and heat generation, preserving the integrity of the workpiece material.