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Surface treatment   black oxide coating  electroplating  zinc plated color 
Grade, rigidity   grade 8.8  grade 10  grade 4.8 
Head or body shape   hexagon  ring type 
DIN 910-1992
HG /T 21573.3-1995
HG /T 21573.3-1995
HG /T 21573.3-1995
JB /ZQ 4450-1997