03B076 - Walter 7/16-20 NF HSS Bottoming Tap for Blind Holes

Precision Threading with Walter High Speed Steel Taps

The Walter 03B076 is a premium-grade 7/16-20 NF Bottoming Tap designed for professional machinists and fabricators who demand accuracy and longevity in their cutting tools. Crafted from the finest High Speed Steel (HSS), this tap is engineered to withstand the high temperatures and stresses associated with cutting threads in tough industrial metals. Unlike carbon steel alternatives, Walter's HSS composition retains its hardness even at elevated temperatures, ensuring that the cutting edges remain sharp longer, thereby reducing the frequency of tool replacements and maintaining consistent thread quality over time.

This specific tool features a "Bottoming" chamfer, characterized by a very short taper of only 1 to 2 threads at the tip. This geometry is critical for threading blind holes—holes that do not pass completely through the workpiece. Standard taper or plug taps leave a significant portion of the hole unthreaded at the bottom due to their longer lead-in chamfers. The Walter Bottoming Tap, however, allows the user to cut full-depth threads virtually to the very bottom of the hole, maximizing the thread engagement length and the holding power of the fastener. It is typically used as the final step in a tapping sequence, following a taper or plug tap, to finish the threads in a blind hole.

Precision ground to exacting tolerances, the threads on this Walter tap ensure a tight and accurate fit for 7/16-20 National Fine (NF) fasteners. The grinding process also produces a smoother surface finish on the tool, which helps to reduce friction during the cutting action and facilitates better chip evacuation. Whether you are working with aluminum, mild steel, or stainless steel, this tool delivers the performance required for high-quality mechanical assemblies. Its hardened and tempered structure further enhances its resistance to chipping and breakage, making it a reliable choice for critical maintenance, repair, and operations (MRO) tasks.

In summary, the Walter 03B076 combines advanced metallurgy with precise geometric design. It is an essential tool for any application requiring full thread depth in blind holes, offering the reliability and precision that industrial professionals expect from the Walter brand.