I believe we are all familiar with waterproof screws, like many outdoor equipment, lamps, instruments and meters will use this type of screw.  Before we talk to you more is the machine thread sealing ring waterproof screw, next, Anzhikou to tell you about another: waterproof screw with sealant.
This waterproof screw is evenly coated with a specific sealant under the screw head at room temperature. After the glue condenses, a stable sealing coating will be formed.  Waterproof adhesive coating is trapezoidal, elastic, will produce reverse torque when the screw is tightened, play a waterproof, anti-loose role.  Generally, this screw is mainly made of stainless steel. It can be passivated for stainless steel screws when used in liquid for a long time, and the imitation embroidery performance will be good.  
Suzhou Anzhikou hardware technology co., LTD. has twenty years of customized production experience screw manufacturers, at present the two waterproof way (sealing ring + waterproof glue coating) we can produce , can also be customized according to customer demand, we can according to your requirement to design free drawings, provide suitable fasteners solutions for you.