Heavy-Duty HDG Double End Studs for Industrial Flanges (DIN 938 / DIN 939)

HDG double end studs comply with DIN938/DIN939 and ASME B16.5, with smooth unthreaded middle shank for flanges, valves and pressure vessels. Centrifugal treatment removes excess zinc on dual threads; matched overtapped A194 2H nuts ensure smooth torque tightening. High-strength alloy studs adopt baking process to avoid hydrogen embrittlement. Thick zinc coating 50–85μm resists salt and abrasion, moisture-proof pallet packaging for petrochemical and desalination projects.