we offer tubesocketweldfittingstube socket weld fittings provide permanent weldedconnections for critical applications involvingcorrosive fluids, shock from pressure surges, temperature cycling and system vibration .pressure ratingspressure ratings listed for reliance tube socket weldfittings are calculated in accordance with pressurepiping code ansi b31.1. all working pressures listedare at 4:1 safety factor for 316 stainless steel. othermaterials are available on request.technical informationthe choice of fitting material and material being welded iscritical. using the same materials will ensure the samecoefficients of expansion, reducing the possibilities of poorwelds, out-of-roundness or dimensional changes that aredetrimental to a good weld connection.standard material is 316 stainless steel (ss). fittings madefrom barstock are manufactured from materials inaccordance with astm a-479 and astm a-276. shapedfittings are manufactured from material in accordance withastm a-182 and astm a-314. pipe threads meet or exceedrequirements of ansi b1.20.1 (npt) for tapered pipe threads