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1. Standard: ANSI/ASME, DIN, BS, IFI, JIS ISO,GB and NON STANDARD
2. Surface finish:plain, black oxide, Zinc plated (blue,white and yellow) chrome plated, Cr+3,Cr+6,H.D.G, Nickle-plate, Dacromet..sheradizing
3. Material:70#,SS304,SS316,Q235B,45#,50#,65Mn,Brass,phosphorus
copper beryllium copper,Aluminium,alloy steel
flat washer/plain washer
