n Steel Fittings-GB/T 699-2015 material no. 35 and 45. Stainless Steel Fittings GB/T 3280-2015 304/06Cr19Ni10 316/ 06Cr17Ni12Mo2 Brass Fittings GB/T 5231-2012 HPb59-1.● Surface Finish-steel fittings standard is Zinc clear plated Chrome 6 free surface protection procedure in accordance with DIN 267 part 9 or DIN 5094. ● Hydraulic fluid power, Cleanliness of parts and components, Inspection document and principles related to contaminant collection, analysis, and data reporting as per ISO 18413.