Flat head carriage bolts are generally called flat head carriage bolts or flat head square neck bolts. They are a kind of carriage bolts. The head of this type of bolt is flat head and the bottom of the head is square neck. The material is generally carbon steel or stainless steel. The surface of the product can be based on It is required to be processed into blackened, galvanized, copper-plated, nickel-plated, phosphating, hot-dip galvanized, hot-chrome film (Dacromet), etc.
Introduction to the materials used for fasteners such as flat head carriage bolts:
At present, the fasteners on the market mainly include carbon steel, stainless steel, and copper. (1) Carbon steel. According to the carbon content of carbon steel materials, it is divided into low carbon steel, medium carbon steel, high carbon steel and alloy steel. 1. Low carbon steel C%≤0.25% is usually called A3 steel in China. It is basically called 1008, 1015, 1018, 1022, etc. abroad. Mainly used for products with no hardness requirements such as grade 4.8 bolts, grade 4 nuts, small screws, etc. 2. The C% of medium carbon steel is 0.25%--0.45%. At present, it is basically not used in the market. 3. Alloy steel: Add alloying elements to normal carbon steel: such as 35, 40 chromium molybdenum, 10B38, etc. (B) Stainless steel. Performance grade: 45, 50, 60, 70, 80 mainly divided into austenite (18%Cr, 8%Ni), good heat resistance, good corrosion resistance, and good weldability. (3) Copper. Commonly used materials are brass-zinc-copper alloys. The market mainly uses H62, H65, H68 copper as standard parts.
