Non-standard screws take a pivotal position in today's industrial production. Product quality can not be sloppy must be strictly in accordance with the corresponding standards of production acceptance, then what are the acceptance criteria for non-standard screws?
1, first non-standard screws are also the evolution of the national standard screws, but also according to the national standard screw surface defects, to determine the specific testing items, please refer to the corresponding national standards in this regard, if the surface coating, the coating affects the identification of surface defects, It should be given before the inspection.
2, according to the design drawings requirements for the non-standard screw dimensions and materials to be inspected, this should pay attention to the detection of materials:
a: The raw material manufacturer is required to provide a material certificate report.
b: High-end products must be SGS material certification, and sent to the relevant laboratory for material composition analysis to confirm whether the composition content meets the requirements of the drawing material.
3, For non-destructive inspection of non-standard screws, if any cracks in any part are found, the support surface and the following wrinkles are examined, and whether the coating meets Jewish environmental requirements.
4, such as the non-standard screw hardness level to do the corresponding hardness impact test; internal hardness, mechanical properties, torque test, etc. These will damage the non-standard screws, but the screw factory with strong quality concept must be tested.
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