Can the extra long self tapping screws pass the salt spray test for 72 hours?

Thomas in the United States wants 2000pcs M5*220 extra long self tapping screws, but he has no drawings, only samples of screws. So he sent the picture of his measuring screw to the Shishitong screw manufacturer.

The measuring tools for screws are basically calipers and micrometers. If you use a ruler and a tape measure to measure the screw, it is very easy to make mistakes. The measurement tool that Thomas sent was the tape measure. After recording the screw size of Thomas, we found that the size of one part is missing, which is the diameter of the rod that extra long self tapping screws.

We asked Thomas what the length of the rod of the extra long self tapping screws is and whether it can accept the mold line. The reason why the mold line appears is because the long screw is produced by the mold clamping machine. When the clamp is clamped, a thin mold line will appear under the head of the screw, which will not affect the assembly.

Thomas said that the diameter of the stem is as large as the diameter of the thread. And he can accept the mold line, but he asked the screw to pass the salt spray test for 72 hours. Because Thomas’s screws are made of stainless steel, so passivation can meet Thomas’ requirements.

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