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Bolts are not included and need to be purchased separately. This product is primarily used to seal the ends of pipelines or connections. It adheres to standards 105NP40 and BS4504 Table 40. Various sizes are available, including DN15 with a 95mm diameter and 16mm thickness, and DN200 with a 375mm diameter and 34mm thickness. Each size corresponds to the steel pipe's nominal bore size according to BS-EN1092-1:2007 standards. The nominal bore is the inside diameter of a pipe. If in doubt about the size needed, please contact our sales team at 01325 488588. This product, JTM PN40 Blank Flange, is specifically the 5-inch option.. JTM PN40 Blank Flange - 5 inch Steel FL-049-C