Square Head Bolt Fasteners

  Standard ASME B 18.2.1, IFI149,DIN931, DIN933, DIN558, DIN960, DIN961, DIN558, ISO4014 and etc. Material Carbon Steel, Alloy Steel, Stainless Steel, Brass and etc. Grade 4.8, 5.8, 6.8, 8.8, 10.9, 12.9 and etc. Finish Plain, Zinc Plated(Clear/Blue/Yellow/Black), Black oxide, Nickel, Chrome, H.D.G and etc. Application Structural Steel; Metal Buliding; Oil&Gas; Tower&Pole; Wind Energy; Mechanical Machine; Automobile: Home Decorating and etc. Notice Please lets know the Size, quantity, Material or Grade, surface, If it is special and Non-standard products, please supply the Drawing or Photos or Samples to us   Square head bolts are divided into 4.8 grade bolts, 8.8 grade bolts, 10.9 grade bolts, and 12.9 grade bolts according to the high-strength grade. According to the screw wire material, there are iron bolts and stainless steel bolts, stainless steel bolts include stainless steel SUS304 bolts, stainless steel SUS201 bolts, stai…