1. Forged flange 2. Technics: CNC,Tap,Milling 3. Standard: ANSI,DIN,JIS,EN,UNI 4. Material: Carbon steel, stainless steel etc Feature: (1) High strength(2) Anti-corrosion(3) Environmental protection(4) Heavy-duty(5) Surface roughness: Ra 6.3(6) Material: Carbon steel, stainless steel, brass, aluminum (or on your demand)(7) Surface finish: Polishing, zinc plated, nickel plated, blackening, acid- ...