If the flat head socket head cap screw cannot be applied, the following situations may occur:

1. Sliding batch. This type of screw manufacturer generally shallows the groove when manufacturing the flat head hexagon socket screw, so it will slide the batch.

2. It cannot be screwed in. If the manufacturer made the diameter of the external thread larger, or the customer gave the wrong specification, or the manufacturer of the spare parts made the diameter smaller. Of course, there is also a situation where the diameter of the external thread made by the manufacturer is within the specification range, but the external thread is damaged, so that it cannot be screwed in.

3. There are flaws on the surface. Since some customers are using flat head hexagon socket screws as appearance parts, they are very concerned about the surface of the screw and cannot allow the surface of the screw to be flawed. This kind of defect is not due to the mold thimble print on the top of the head, the uneven surface of the electroplating process or scratches.

4. The screw is broken. The slot of the screw is too large, and the slot is also very deep, and it is driven into the rod, so this kind of screw may also be broken.

Therefore, when you find that the flat head socket head cap screws cannot be used, don't worry, and analyze the specific problems in depth.

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