The second half of the phantom "B1864" standard points to ASME B16.4 - 2021: Gray Iron Threaded Fittings.
ASME B186.4 is the American Society of Mechanical Engineers standard that specifies dimensions, tolerances, markings, and related requirements for butt-weld fittings of cast stainless steels (commonly used in piping systems). It covers types, sizes, material grades, wall thicknesses, and inspection/identification practices to ensure compatibility and safe welding/assembly in pressure piping. asme b1864 pdf
If you are dealing with bolts, screws, or nuts, you will find your answer here. A common mis-type for B1864 is B18.6.4. The second half of the phantom "B1864" standard
| Standard | Title | Common Use Case | | :--- | :--- | :--- | | ASME B18.2.1 | Square, Hex, Heavy Hex, & Askew Head Bolts | General industrial hex bolts | | ASME B18.2.2 | Square and Hex Nuts | Heavy hex nuts, jam nuts | | ASME B18.6.4 | Thread Forming & Thread Cutting Tapping Screws | Sheet metal screws, self-tapping fasteners | | ASME B18.3 | Socket Cap, Shoulder, and Set Screws (Inch Series) | Hex socket head cap screws | If you are dealing with bolts, screws, or