The flatness of the standard universal square box square box in the People's Republic of China Machinery Industry Standard JB / T 7974-2000 can be found. The selection of flatness standard square box is generally based on the use, where appropriate, may be. More than 3 flat square box used as a test, crossed, assembly and use, the following three flat square box is generally used as the use of riveting and so on. 
 Product Specifications: 150 * 150 * 150-600 * 600 * 600 (mm) 
 Special specifications can be customized according to customer requirements and drawings 

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