Complete set of GB flange size table

Common diameter:15-2000mm; Nominal pressure: 0.1.0.25.0.6.1.0.1.6.2.5.4.0.6.4.10.0/6.0. National standard: GB/t 9112-2000 (GB 913.1-2000 ~ GB 9123.4-2000).

DN 100 is a 3.5-inch flange with an outer diameter of 220mm, a bolt hole spacing of 180mm, a bolt diameter of 18mm, 8 bolts and a flange thickness of 22 mm. ..

Matters needing attention

The outer diameter of GB flange is represented by D, the central circle of bolt holes is represented by K, the number of bolt holes is represented by N, the sealing surfaces are represented by D and F, the flange thickness is represented by C, and the inner diameter of large-diameter flange is represented by B. ..

Nominal pressure is expressed by PN. The main materials of large-diameter GB flange are carbon steel, stainless steel and alloy steel. Alloy steel is the most expensive, followed by stainless steel, and carbon steel flange is the cheapest. The main producing areas of large-diameter national standard flanges are Dingxiang, Shanxi, Wenzhou, Zhejiang and Cangzhou, Hebei. The large diameter flange in Dingxiang, Shanxi has the highest output and the best quality.