McMaster 1802N36 Low Pressure Steel Threaded Pipe Flange, 1 1 2 NPT × 3 Flange Pipe Size G4691583 Range 400 Degrees to 500 Range 400 Degrees to 500 Degrees F Material PTFE UV Resistant Yes Plastic Hardness Rating Medium Soft Plastic Density 13 Equivalent BtuH 81 Flange Fitting Connection NPT Female Pipe Size (A) 1 1 2 For Flange Pipe Size (B) 3 Flanged Connection Surface (B) Raised Flange OD 7 1 2" For Bolt Diameter 5 8" Bolt Hole Diameter 3 4" Number of Bolt Holes 4 Bolt Circle Diameter 6" Pressure Class 150 Material Steel Maximum Pressure @ Temperature 285 psi @ 72° F Maximum Steam Pressure @ Temperature 230 psi @ 300° F Certificate Form Digital Certificate Type Material Certificate with Traceable Lot Number Connects To Pipe Flange Construction One Piece For Fitting Material Iron Bolt two flanges of the same size together with a gasket (sold separately) to create an access point within a line