Pick a flange size from NPS 1/2 up to NPS 60, a pressure class and facing to get the stud count, diameter, thread and length for one joint. Choose a grade and coating, then add the line to a request and send it to EMG for a price.
Series A (from MSS SP-44) is the heavier flange; Series B (from API 605) is more compact with more, smaller studs. Check the flange marking.
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Stud counts, diameters, flange OD and bolt circle follow ASME B16.5 up to NPS 24 and ASME B16.47 Series A or B from NPS 26 to 60. B16.47 lengths are for raised-face flanges, converted from millimetres to the nearest 1/4 in. B16.5 stud lengths are the standard lengths for a 1/16 in. raised face (Class 150 and 300), a 1/4 in. raised face (Class 600 and up) or a ring joint, with a standard gasket. The 3D flange is drawn from these figures; flange thickness and hub shape are representative.
Check lengths against your gasket, any spacers or insulation kits, and ASME PCC-1 before ordering. EMG supplies studs and nuts to your bolting schedule with EN 10204 3.1 mill certificates, and Bureau Veritas certified ISO 9001:2015 quality.