Points for lightning protection when purchasing countersunk stainless steel screws

For fasteners, if you purchase without knowing it, it is easy to step into the pit. After all, the fastener industry is not that simple. For example, when we are purchasing countersunk stainless steel screws what points should be paid attention to?

1. What is the specific grade of countersunk stainless steel screws?

For those who are not familiar with screws, stainless steel is stainless steel, there is no difference. But for the familiar, there are many kinds of stainless steel, such as 201, 304, 316 and other grades. The composition, performance and price of different grades of stainless steel are different.

The price of 201 grade stainless steel screws is very cheap compared to other grades of stainless steel, and the quality is not very good, it is easy to rust, and the corrosion resistance is not very good.

The 304 grade stainless steel is used more in the screws. After all, the corrosion resistance of the screws produced by this grade is also relatively good, and the quality is also good.

2. Whether it can pass the rules

The thread stop gauge is mainly to confirm that the manufacturer has not cut corners. But this is only suitable for machine screws.

Some screw manufacturers do not use standard wire diameters when producing screws, but instead use smaller wire diameters for production. The outer diameter of the screw thread produced by this kind of screw is consistent, and it can pass the regulation, but the regulation cannot be stopped.

3. Whether there are defects on the surface and whether the size meets the requirements

If it is used for appearance parts, the surface of the screw must not be defective, otherwise it will affect the aesthetics, and the size must be consistent, otherwise there will be problems during assembly.

When purchasing countersunk stainless steel screws, it is not only necessary to pay attention to these points, but also the delivery time of the screws, after-sales issues and so on.

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