How to check and accept extra long screw?

Although the extra long screw is also a non-standard screw, it is also evolved from the standard screw. However, compared with the standard screw, its length will be longer, so its acceptance standard is basically in accordance with the corresponding national standard.

1. Surface. If the surface coating or coating on the extra long screw will affect the identification of surface defects, it should be selected and placed on the other side during inspection. And then according to the corresponding standards and customer requirements to pick out the unqualified.

Ii. Size. Inspect the shape, size and material of the extension screw according to the drawing confirmed to the customer. For material inspection: one is to ask the raw material manufacturer to provide the relevant material certificate report; The second is to provide corresponding certificates according to the requirements of customers. Third, it is sent to the relevant laboratory for material composition analysis to confirm whether the composition content meets the requirements of the material in the drawing.

Iii. Functional requirements non-destructive inspection. Non-destructive inspection of the extra long screw shall be carried out if hardening cracks on any part, wrinkles on the support surface and below are found, etc.

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