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Housing | Coatings | Bolts and Nuts | ||||
Couplings housing are made of ductile cast iron material, standards is the same as American ASTM A 536, grades as 65-45-12. Ductile cast iron material is not easy to rust, with high tensile, strong ductibility, flexible extension ability as well as strong strong vibration and noise reduction performance. | Standard: red painting (Standard epoxy resin) Optional: blue painting, silver painting, nickel plating | Colorful Zn plating Bolts: mechanical performance grade 8.8 (GB/T 3.98.1) Heavy duty nuts: mechanical performance grade 8.8 (GB/T 3.98.2) |
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