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The bolt hole drilling for a 36″ Class 150 welding neck flange RF, manufactured in accordance with ASME B16.47 Series A. The bolt holes shall be equally spaced, and pairs of bolt holes shall straddle fitting centerlines. The drilling & bolting dimensions for this flange are: diameter of bolt circle = 1028.7 mm, No. of bolt holes = 32, diameter of bolt hole = 1-5/8″, diameter of bolt = 1-1/2″.