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The screws are now widely used. We can see the screws on many items. And we can see that some screws have beautiful surfaces and many colors. The surface treatment of these screws is basically plating to meet a certain demand, such as achieving corrosion resistance and a beautiful appearance. So what are the plating requirements for screw surface treatment?
| Coating thickness in line with national standards | Effective coating thickness | ||
| Local thickness
min |
Batch average thickness | ||
| min | max | ||
| 3 | 3 | 3 | 5 |
| 5 | 5 | 4 | 6 |
| 8 | 8 | 7 | 10 |
| 10 | 10 | 9 | 12 |
| 12 | 12 | 11 | 15 |
| 15 | 15 | 14 | 18 |
| 20 | 20 | 18 | 23 |
| 25 | 25 | 23 | 28 |
| 30 | 30 | 27 | 35 |
When the surface coating thickness of the screw is not up to the standard, there is a risk that the thread will interfere during assembly. Therefore, when measuring the coating thickness of screws, the measured value should meet the requirements in the above table.
5 月-23-2018
kalyn
+86 13143444311
sst@szsst88.com
