1, the variety, specifications, performance of the bolt ball should conform to the current national product standards and design requirements, in order to ensure the safety of the bolt ball grid engineering, generally need to use the product has a quality certificate, Chinese marking and product quality inspection report.
2, bolt ball thread size should meet the current national standards, inspection quantity: each specification according to the number of spot check 5%, and should not be less than 3. Inspection method: use standard thread gauge.
3, the diameter of the bolt ball, roundness, the Angle of the center line of two adjacent bolt holes and other dimensions and allowable deviation should reach a certain standard, inspection method: with caliper and indexing head instrument inspection.
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