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By certification 
1. Standard: F436.
2. Grade: Hardened Washers, need Heat Treatment.
3. Size: M12-M76, 1/2"-3".
4. Material: Carbon Steel,1045 Steel.
1. Standard：ASME B18.22.1 1965(R 1998),DIN125.
2. Grade：Gr.4.8, Gr.5,Gr.8.8.
3. Size: M12-M76, 1/2"-3".
4.Material: Carbon Steel.
2. Grade: Hardened Washers, need Heat Treatment.
3. Size: M12-M76, 1/2"-3".
4. Material: Carbon Steel,1045 Steel.
1. Standard：ASME B18.22.1 1965(R 1998),DIN125.
2. Grade：Gr.4.8, Gr.5,Gr.8.8.
3. Size: M12-M76, 1/2"-3".
4.Material: Carbon Steel.
