Commonly used hex socket head cap bolts are grade 4.8, 8.8, 10.9, 12.9, etc. Usually, the hex socket bolts of grade 8.8 and above are called high-strength Allen bolts, of which the hex socket bolts screws of grade 12.9 have knurling. The hexagon socket head cap bolts below grade 8.8 are called ordinary hex socket bolts.

Galvanized hex socket head cap bolts have good anti-corrosion performance and are mainly used in metal structural facilities in various industries. It is to immerse the rust-removed bolts in a molten zinc solution of about 500 ° C, or use electroplating to attach a zinc layer to the surface of DIN912 hex socket screws, so as to achieve the purpose of anti-corrosion.

DIN912 hexagon socket head cap bolts are also called Allen bolts. Hexagon socket head bolts are widely used in mechanical installations because they are easy to fasten, disassemble, and not easy to slip.

Hex socket head bolts, also known as Allen bolts, cylindrical hex socket head cap screws, hex socket head cap screws, cup head screws. Hexagon socket screws are made of stainless steel, carbon steel, alloy steel and so on.