China Grade 8.8 Stainless Steel CNC Machining Fastener Manufacturer Junying Offers CNC Machining Fasteners, M2-M100 Sizes, Common Connection. Basic Info. Grade: 8.8. Sizes: M2-M100. Connection: Common. Standards: DIN, ANSI, ISO, BS, GB. Materials: Stainless Steel (SS304, SS316, SS201, SS410) and Carbon Steel.