Suitable processing range and precautions for fastener (screw) surface treatment type
Fastener (screw) surface treatment types such as: Dacromet, Kummet, hot dip zinc, zinc-nickel alloy, chrome plating, blackening, phosphating black, 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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Nickel plating, electrophoresis black, mechanical galvanizing. Suzhou Hongyi screws organize and share the specifications and precautions for suitable processing of these surface treatment types: 