Expansion Joint Bolt Circle Diameter 3 1/8 in Bolt Hole Size 1/2 in Bolt Hole Threading Unthreaded Burst Pressure 288 psi Compression Distance 1/2 in Connection Type Flanged Expansion Distance 1/2 in Expansion Joint Type Convoluted Features Reinforcing Rings Flange Diameter 6 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