What are the acceptance criteria of non-standard screws?

Non-standard screws have taken a pivotal position in today's industrial production. Product quality must not be carelessly produced and accepted in strict accordance with the corresponding standards, so what are the acceptance standards for non-standard screws?

First of all, non-standard screws are also the evolution of national standard screws, and specific inspection items should be determined according to the national standard screw surface defect standards. Please refer to the corresponding national standards for details. If the surface coating and plating affect the identification of surface defects , It should be selected before the inspection. (Guide: What should be considered when choosing stainless steel screws)

Secondly, inspect the dimensions and materials of non-standard screws according to the requirements of the design drawings. This should pay attention to the material inspection. First, the raw material manufacturers should provide the material certificate report. Second, high-end products must require SGS material certification, and send to relevant laboratories for material composition analysis to confirm whether the composition content meets the material requirements of the drawings.

The function requires non-destructive inspection again. When non-destructive inspection of non-standard screws is carried out, if there are quenching cracks on any part, wrinkles on the supporting surface and below, and the coating meets Rosh environmental protection requirements .

Then there is destructive inspection, such as non-standard screw hardness level, do the corresponding hardness impact test; internal hardness, mechanical properties, torque test, etc., all of which will damage the non-standard screw, but the screw factory with a strong concept of quality All of these must be tested items.

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