The concave spherical washer GB850-88 is a mechanical component specified by the Chinese national standard GB/T 850-1988, also known as a conical washer. This type of washer is primarily used for mechanical connections and sealing, and its design aims to provide better pressure distribution and sealing effects between connected parts. Here is more detailed information about the concave spherical washer GB850-88:

1. Specification and Size: The specification and size range of GB850-88 conical washers varies from 6mm to 48mm, including specific dimensions such as the major diameter of the thread (d), outer diameter (D), and height (h). For example, a washer with a specification of 16mm has a minimum major thread diameter (d) of 8mm and a maximum of 10mm; a minimum outer diameter (D) of 16mm and a maximum of 21mm; and a maximum height (h) of 4mm.

2. Material: Commonly used materials include carbon steel, stainless steel, alloy steel, etc. For instance, 45# steel is a commonly used material with a heat-treated hardness of HRC40～48. The choice of material depends on the application environment, such as temperature, pressure, corrosion resistance, and so on.

3. Surface Treatment: Washers can be treated in various ways, such as oxidation treatment, galvanization, blackening, etc., chosen based on different application requirements. Surface treatment can provide additional corrosion protection and enhance the durability of the washers.

4. Weight: The weight of conical washers varies with different specifications. For example, the weight of 1000 pieces of 6mm steel conical washers is approximately 0.91kg, while the weight of 48mm specification washers is about 448.6kg. The choice of weight depends on the application scenario and needs.

5. Standard Status: The GB/T 850-1988 standard is currently in effect and has been implemented since January 1, 1989, replacing the GB 850-1976 standard. The implementation of this standard ensures that the manufacturing and quality control of concave spherical washers meet national standards, improving the reliability and stability of the products.

In summary, the concave spherical washer GB850-88 offers a variety of specifications and material options, widely used in the fields of mechanical connections and sealing. Its design conforms to national standards, ensuring the stability and reliability of mechanical components. At the same time, suitable materials and surface treatment methods can be selected according to different application requirements to adapt to various working environments and demands.