Steam Rotary Joints Yu Hang Aerospace Quipment Base Info Model NO.:QDMaterial:BrassConnection:MaleSurface Treatment:Nickel-PlatedHead Type:Round Description Pre:Carbon Steel DIN931 933 Grade 4.8 5.8 8.8 M30 M36 Hot DIP Galvanized Electrical Hex Head Bolt Next:Carbon Steel DIN960 961 Grade 4.8 6.8 8.8 M20 M24 HDG Hex Bolt with Flat Washer for Power