DIN933 is a German standard hexagon bolt, which is suitable for full thread hexagon bolts with a diameter of M1.6-M52. The general carbon steel grades are mainly 4.8, 8.8 and 10.9. The common standards are DIN931 and DIN933 for metric coarse thread; DIN960 and DIN961 are for metric fine thread hex bolts.

There are different grade for hex bolts, such as 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, etc. Among them, the hexagonal bolts of grade 8.8 and above are made of low-carbon alloy steel or medium-carbon steel. It reaches different grade after heat treatment (quenching, tempering).

Zinc coating is a bolt process that is widely used now. It can not only improve the service life of hex bolts, but also make the hex bolts more beautiful. Jinrui can provide you with two kinds of galvanizing commonly used for hexagon bolts, One is electro-galvanized. After electro-galvanizing, if the hexagonal bolt encounters humid air, the zinc film on the surface of the bolt can isolate the air from the bolt base, so that the bolt wil not be easily corroded.

Hexagon bolts are a type of fastener consisting of a head and a threaded rod (a cylinder with an external thread), which need to be matched with a nut to fasten and connect two parts with through holes.