Expansion Joint Bolt Circle Diameter 4 3/4 in Bolt Hole Size 5/8 in Bolt Hole Threading Unthreaded Burst Pressure 740 psi Compression Distance 1/4 in Connection Type Flanged Expansion Distance 1/4 in Expansion Joint Type Convoluted Features Reinforcing Rings Flange Diameter 8 1/8 in Flange Material Ductile Iron Flange Material Grade Not Applicable For Fluid Type Acids Caustics Joint Material PTFE Joint Material Finish Not Applicable Joint Material Grade Not Applicable