JPI/ASME flange dimensions and bolt size list
A practical quick reference table (15A to 500A) that clearly distinguishes bolt and screw standards based on official data!
Are you having trouble determining whether the bolt threads that fit 150LB (Class 150) or 300LB (Class 300) flanges in the maintenance of overseas plant equipment or in the construction of piping lines designed for oil refining and chemical plants are in metric standards or unified standards (inches)? Do you want to know the exact length of the stud bolts? In domestic plants, the JPI-7S-15 (Flanges for Petroleum Industry) standard, which is based on ASME B16.5, is widely used. While the basic dimensional system is based on ASME B16.5, there are also differences tailored to domestic operations, so it is necessary to confirm the actual specifications. Since these differ from the familiar JIS standards (10K/20K, etc.) in terms of outer diameter, P.C.D (the diameter of the circle connecting the centers of the bolt holes), and the number of bolts, if you do not confirm the exact specifications and arrange accordingly, it could lead to nonconformities on-site or leakage risks due to poor fastening. *For detailed content of the column, you can view it through the related link. For more information, please download the PDF or feel free to contact us.*
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