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Designed to seal the ends of pipelines or connections, especially in applications where pipe flow blocking is required, the JTM PN16 DN40 Blank Flange adheres to BS4504 Table 16. The DN40 has a 150mm diameter, 16mm thickness, and 110mm PCD with 4 holes for M16X55 bolts. All sizes fit steel pipes' nominal bore, according to BS-EN1092-1:2007. Nominal bore refers to the inside diameter of a pipe. Highly durable, and with four holes for bolt attachment, it can withstand pressure rated at 16 bar. Bolts are not included and must be purchased separately.. JTM PN16 DN40 Blank Flange - 1 1/2 inch Black Steel FL-024-B