1.Material: carbon steel, 45#,35#, 20# 2.surface treatment: zinc plating, salt spray ... Type Tube Fittings, Metric Thread 74 degree Cone Flared Tube Fittings, BSP Thread 60 degree Cone Fittings, BSPT Thread Fittings, NPT Thread Fittings ... Tube Fittings, ORFS Fittings, Japanese Metric Thread 60 degree Cone Fittings, Japanese BSP Thread 60 degree Cone Fittings, NPSM Fittings, ISO 6162 Flange Fittings ...