The ASME B18.6.4 standard, which covers thread-forming and thread-cutting tapping screws and metallic drive screws (inch series), has been superseded and consolidated into ASME B18.6.3. While the 1998 version (reaffirmed in 2005) is still referenced in legacy projects, users are generally directed to the updated ASME B18.6.3-2024 for the most current data. Overview of ASME B18.6.4
This standard provides comprehensive general and dimensional data for various slotted and recessed head fasteners. ASME B18.6.4 Self-Tapping Screw Specs | PDF - Scribd asme b1864 pdf
This is the most likely category for your search. If you work with dimensions of flanges, fittings, or valves, you need a B16 standard. Key standards include: The ASME B18
| Standard | Title | Common Use Case | | :--- | :--- | :--- | | ASME B16.9 | Factory-Made Wrought Buttwelding Fittings | Long-radius elbows, tees, caps, reducers | | ASME B16.11 | Forged Fittings, Socket-Welding and Threaded | High-pressure, small-bore fittings (3000/6000/9000 class) | | ASME B16.5 | Pipe Flanges and Flanged Fittings | Flanges NPS 1/2 through NPS 24 | | ASME B16.47 | Large Diameter Steel Flanges | Flanges NPS 26 through NPS 60 | | ASME B16.34 | Valves—Flanged, Threaded, and Welding End | Pressure-temperature ratings for valves | Type U: These are multiple-threaded, drive screws with
Often confused with B16/B18, the B1 series covers the geometry of threads.
| Standard | Title | Common Use Case | | :--- | :--- | :--- | | ASME B1.20.1 | Pipe Threads, General Purpose (Inch) | Standard NPT threads |