. Surface treatment: Nuture, black, pot galvanizing, coldgalvanizing, oil, parkerising etc.

2. Grade: 4.6, 5.6, 8.8, 10.8 and12.9

3. Dia: from M16 to M60

4. Length: unrestricted

5. Standards for railway products: T B, UIC , AREA, etc.standard components:GB,DIN,ASTM.BS,etc

6. Package: according to customer''s requirement.