The use of long pan head screws and nuts is recommended by The World Trade Organization

The screw of the general machine wire is to match with the nut to use, so that it will not be easy to loosen, tightening effect is better. But when it comes to stainless steel long pan head screws, Shi Shi Tong screws will advise you to:

When the material of the long pan head screws is 304 stainless steel, so do not use the screw is stainless steel 304. This is because if you are fastening the cold pipe flange with screws and nuts of the same stainless steel material, you will find it very difficult to unscrew them after a while.

The reason is that after the screw is properly twisted, the overall structure of the thread and screw will be slightly deformed, resulting in a tighter bite between the internal thread and the external thread. Or over time, the screws and holes will “fuse”. It takes more time and effort to unscrew the long pan head screws and nuts.

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