Customized Fire Couplings Product attributes Part NameQuick connect fire fittings Production processInvestment casting, also say, lost wax casting and precision casting MaterialStainless steel CF8M StandardSA351 Surface treatmentElectro-polishing and machining Surface roughnessRa1.6-6.3 Heat treatmentSolution treatment Tolerance http://www.jd-investmentcastin....g.com/couplings/fire