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Bolts must be purchased separately. This product is mainly used to seal the ends of pipelines or connections. It features BS4504 Table 6 specifications. Note sizes: DN15 is 80mm diameter and 12mm thick; DN20 is 90mm diameter and 14mm thick; DN25 is 100mm diameter and 14mm thick; DN32 is 120mm diameter and 16mm thick; DN40 is 130mm diameter and 16mm thick; DN50 is 140mm diameter and 16mm thick; DN65 is 160mm diameter and 16mm thick; DN80 is 190mm diameter and 18mm thick; DN100 is 210mm diameter and 18mm thick; DN125 is 240mm diameter and 20mm thick; DN150 is 265mm diameter and 20mm thick; and DN200 is 320mm diameter and 22mm thick. Holes and bolt sizes correspond to specifications. The flanges are covered in a primer finished black paint, which may chip or flake off during transportation. This does not affect the quality. When installed on pipework with a pump or valve, the flange is usually painted in red oxide to protect from rust.. JTM PN6 Screwed Flange Black - 3/4 inch Steel FL-061-D