Color:Black Model Number:DIN931 Material：40Cr,35CrMo Brand Name: ZYL Grade:grade 10.9 Packing:Cartons+plastic Bags Strength: High tensile Keywords: bolt nuts washers, hex nuts and bolts, hex head bolt, DIN931,high strength bolts 1.What is the function of external hexagon head bolts? Hexagon bolts are used with nuts to fasten and connect two connected parts with through holes. External hexagon bolts are commonly used bolts. 2. Does the length of the hexagon bolt include the head? The length of the hexagon bolt does not include the head 3.What is your main product? We mainly produce all kinds of fasteners, such as bolts, nuts, threaded rods, washers, etc. 4.What service can you provide? Always provide quality products with the most competitive price and first-class service. 5.How can I get the price? We usually quote within 24 hours after we get your inquiry(Except weekend and holidays). 6.Can I buy samples placing orders? Yes.Please feel free to contact us. 7.What is your MOQ? Our product MOQ is 1 pcs.