03B123 - Walter 3/4-10 NC HSS Bottoming Tap for Blind Holes

Precision Threading for Blind Holes

The Walter 03B123 3/4"-10 NC Bottoming Tap is a premium-grade threading tool designed for industrial maintenance, repair, and fabrication professionals who demand accuracy and longevity. Crafted from high-quality High-Speed Steel (HSS), this tap is engineered to withstand the high temperatures and stresses associated with cutting threads in tough metals. Unlike standard carbon steel taps, Walter's HSS composition retains its hardness at higher temperatures, ensuring a longer service life and consistent thread quality over time.

This specific model is a "bottoming" tap, characterized by a very short chamfer length of typically 1 to 2 threads. This design is critical for threading blind holes—holes that do not go all the way through the workpiece. The short chamfer allows the tap to cut full-depth threads almost to the very bottom of the hole, maximizing the thread engagement length for bolts and studs. This is often the final step in a three-stage tapping process (following taper and plug taps) or used directly in soft materials or shallow holes where maximum thread depth is required immediately.

The threads on the Walter 03B123 are precision ground, not cut, which provides a smoother finish and tighter tolerances. This results in fasteners that fit securely with less play, reducing the risk of stripping or loosening under vibration. The tool is hardened and tempered to strike the perfect balance between hardness for cutting and toughness to resist chipping. It performs exceptionally well across a variety of materials, including aluminum, mild steel, and stainless steel, making it a versatile addition to any machinist's or millwright's toolkit.

Whether you are fabricating new components or repairing damaged threads in existing machinery, this Walter tap delivers the performance needed to get the job done right. Its robust design reduces the torque required to turn the tap, minimizing operator fatigue during hand tapping operations while also being suitable for machine setups where precision is paramount.