When assessing the price of tungsten carbide taps, you must prioritize material grade (specifically cobalt content) and grain size, as micro-grain carbide offers superior wear resistance. Ensure the taps feature advanced coatings such as TiAlN (Titanium Aluminum Nitride) or AlTiN, which significantly enhance heat resistance and tool life in high-speed applications. Additionally, verify the thread tolerance class (e.g., 6H or 2B) and the flute geometry (spiral vs. straight) to ensure compatibility with your specific workpiece material, such as hardened steel or cast iron.