Fastener (screw) surface treatment types such as: Dacromet, Kummet, hot dip zinc, zinc-nickel alloy, chrome plating, blackening, phosphating black,
Nickel plating, electrophoresis black, mechanical galvanizing. Suzhou Hongyi screws organize and share the specifications and precautions for suitable processing of these surface treatment types:Processing range of abnormal plating products
Serial number
name
Processing range
Remarks
1
Dacro
M6 (included) can be processed upwards, and the gasket processing is difficult
The inner hole product is prone to effusion, the salt spray time is long, and the normal non-detection pass regulation can only be used.
2
Kumet
M5 (including) screws can be processed, nuts need M6 (including) to go up, gasket processing is difficult
The appearance is more delicate and beautiful than the Dacromet, and the inner hole is also prone to effusion.
3
Hot dip zinc
M8 (included) can be processed upwards, and the gasket processing is difficult
The appearance is ugly, but the salt spray time is long; when the normal screw and nut are matched, the nut needs to be reamed or screwed.
4
Zinc-nickel alloy
M3 (inclusive) can be processed upwards
The coating is thinner than the above three, the salt spray time is longer than the galvanizing time, and it is widely used in the automotive industry, and the price is higher.
5
chrome
M3 (inclusive) can be processed upwards
More normal plating
6
Black
M2 (included) can be processed upwards
It is common in the market to blacken, if the subsequent resistance is easy to appear black products fade
7
Phosphating black
M3 (inclusive) can be processed upwards
More black
8
Nickel plating
M2 (included) can be processed upwards
　
9
Electrophoresis black
M2 (included) can be processed upwards
Hang plating, high price
10
Mechanical galvanizing
M3 (inclusive) can be processed upwards
High price, M3-M6 processing is difficult, processing must first inquiry or sample first and the amount is large
Remarks: The above coatings are more difficult than the screw nuts when processing the gaskets, and often there are some differences in price; often the products are below the M5 and the M16 is up. It is recommended that you make a decision after the inquiry is confirmed, so as not to report the error. The price brings unnecessary trouble to the customer.
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