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Bolts are not included and must be bought separately. This product is generally used to seal the ends of a pipeline or any connection. It follows the PN6 BS4504 Table 6 standard. Sizes vary as follows: DN15 has a diameter of 80mm, thickness of 12mm, PCD of 55mm, and requires 4 M10X45 bolts; DN20 has a diameter of 90mm, thickness of 14mm, PCD of 65mm, needing 4 M10X50 bolts; DN25 with 100mm diameter, 14mm thickness, PCD of 75mm, requires 4 M10X50 bolts. Sizes continue to increase up to DN200, which has a diameter of 320mm, thickness of 22mm, PCD of 280mm, and needs 8 M16X70 bolts. Each size matches specific measurements and bolt requirements, from DN15 to DN200. JTM PN6 DN32 Galvanised Screwed Flange is 1 1/4 inch.. JTM PN6 DN32 Galvanised Screwed Flange - 1 1/4 inch Silver Galvanised Steel FL-203-J