grade

standard

material

diameter

length

surface

3.6

(A)DIN

(A)Carbon Steel

m6-m30

10mm-250mm

(A)zinc

4.6

1.DIN933

1.C1008

1/4''-1'''

1/2''--10''

1.white zinc

4.8

2.DIN931

2.C1010

2.white and blue 

5.6

3.DIN960

3.C1020

3.yellow zinc

5.8

4.DIN961

4.C1035

(B)plain

6.8

5.DIN558

5.C1045

C) Black

8.8

6.DIN601

6.Q235

D)H.D.G

10.9

7.DIN7990

7.Q195

(E)CR3+zinc

(B)ISO

(B)Swrch35k

(F)CR6+zinc

1.ISO4014

C)45#

(G)dacromet

2.ISO4017

(C)BS

(D)ANSI/ASME