Heavy Strength Hexagonal Structure Bolts(GB/T 1228-1231)
1.Main Size:M16~M30 ,length: 35mm~260mm,according to the request of customers;
2.Material:Carbon steel or alloy steel;
3.Standard: GB/T 1228-1231;
4.The Mechanical Grade:10.9/8.8;
5.Surface Treatment:Zinc-plated(Black or Plain),Hot dip galvanizing,Dacromet,etc.