If your company needs multiple standards, an ASME Standards Unlimited subscription provides unlimited access to all B-series standards for an annual fee.
One of the most critical aspects of ASME B18.6.4 is the classification of thread types for Tapping Screws. asme b1864 pdf
Since you are likely working with dimensional standards for mechanical components, here are the real ASME standards that matter. Locate these PDFs instead. If your company needs multiple standards, an ASME