This specification covers the requirements for the coating layer of military opticalin strument, including mass assurance provisions, delivery preparation and description matters, etc. The scope of application includes the coating layer of metal parts used in military opticalin strument, and civilian products can also be referred to for use. The coating layer is classified by use, and the specific classification is shown in Table 1. The cited documents include the mechanical drawing surface roughness code and its labeling, Coating product classification, naming and model, etc. The technical requirements for the coating layer are usually applicable to the main surface. When required, the main surface is specified by the product drawing or samples are provided. Qualified products should be approved by identification or setting. The paint used for painting should meet the technical requirements of the Coating standard. The requirements for the substrate include not allowing defects exceeding the mass standard, such as bumps, cratering, sinkage, etc., and there should be no defects affecting the painted mass such as molding sand and Coating sintered materials.