DIN And GB Standard Stainless Steel Screws

What is GB stainless steel screw? When we refer to GB stainless steel screws, we first need to start with their material. If it is a 304GB stainless steel screw, then its material must be produced by an authentic manufacturer. We always say that an authentic manufacturer, but what exactly is an authentic manufacturer? In fact, this is very easy to recognize. The domestic steel manufacturing industry is mostly state-owned or central enterprises, and only a few steel companies can be counted. As long as the materials are provided by these manufacturers, there will be no problems. We are afraid that there may be problems at the source of material procurement. Some stainless steel screw manufacturers, in order to reduce costs, purchase from some small steel refining and processing plants. This type of material cannot meet the GB standard, So achieving GB material is the first level.

The above picture shows the wire of GB stainless steel screws before production. It is made of raw materials in rolls, which are then placed on the equipment conveyor belt and punched out one by one through a mold.

The second level is manufacturing. Regardless of the type of stainless steel screw, every standard parameter can be found in the fastener manual issued by the country, which is the basis for production. These technical parameters include screw size, performance, length, thread diameter, thread diameter, etc. Only when these parameters are within the standard range can they be referred to as GB stainless steel screws.

What is a DIN stainless steel screw? DIN stainless steel screws are produced according to the technical parameters of the German standard DIN933 or DIN931, which is currently highly consistent with the national standard. Except for a few specifications that cannot be used interchangeably, the vast majority of specifications are the same. However, in the field of stainless steel screws, many users annotate DIN stainless steel screws in their systems. Therefore, when orders are formed, they are directly displayed as DIN stainless steel screws. We only need to clarify the differences in individual specifications.

The biggest difference between DIN stainless steel screws and GB stainless steel is the size difference on the opposite side of the head of the hexagonal bolt. For example, for M8 hex screws, the national standard for the opposite side is 13 millimeters, while the DIN for the opposite side is 14 millimeters. Except for this, all other threads are the same. If the hexagon socket screw is used, the hexagonal hole on the opposite side of DIN912 hexagon socket should be larger than GB/T70, and the installation tool used should also be one size larger.