Release time：2020-01-16 18:44 Browse：
Surface treatments for long or extra-long screws typically include zinc plating, hot-dip galvanizing, Dacromet, Ruspert, black oxide, and phosphating. The choice depends on the application environment (indoor, outdoor, coastal), corrosion resistance requirements, and cost considerations.
For screws longer than 100mm, rack plating is generally necessary. This is because barrel plating may cause bending, scratches, or uneven coating—long screws don't rotate well in the barrel.
However, if a spray-type coating like Dacromet or Ruspert is used, screws can be treated while laid flat or hung, and rack plating may not be required. It depends on the specific surface treatment method.
