Customers often ask, do non-standard screws have any other colors besides their actual appearance? Yes, screw manufacturers tell you that non-standard screws not only have substance, but also black, sandblasted, chrome plated, Dacromet, etc.
So, besides stainless steel passivation treatment, how many of the following are commonly used black treatments, such as environmentally friendly black zinc plating
Its benefits are relatively dark in name and moderate in environmental protection unit price. The downside is that if it requires more than 50 hours of salt spray testing, it may appear pale.
Surge treatment is a VIP electroplating method used by non-standard screw manufacturers. It not only has a bright and pleasing color, but also has a VIP price per unit. Its salt spray resistance will last longer than environmentally friendly black zinc. Non standard screw customization inspection method: The inspection method for standard fasteners is specified in the technical specifications of the product. And professional standards have been established for the testing methods of fasteners (size and geometric accuracy).
The black Dacromet is a non-standard screw treated invisible and plain second-generation product, with a relatively moderate unit price. The important thing is that it has a long salt spray resistance time. Therefore, we advocate adopting this treatment method for customers who both request salt spray testing and are concerned about the nominal aesthetic treatment. After treatment, its nominal comparability is correspondingly high. Non standard screws are divided into three main parts: size, mechanical properties, and surface defects. The specific inspection items for each section have different regulations based on different products. Screw customization, such as size inspection items, specifies the thread gauge, thread stop gauge, thread small diameter, opposite edge width, diagonal dimension, nut height, and the perpendicularity of the nut support surface to the thread axis for hex nuts; The specifications for flat washers include inner diameter, outer diameter, thickness, coaxiality of the outer circle to the inner hole, and flatness. The mechanical performance inspection items for hexagonal nuts are specified as hardness and tensile strength; And only the hardness is specified for flat washers.
The screw manufacturer tells you that today's customers' needs have become diversified, and they no longer only need non-standard black screws. Our American customers have requested 5 different treatments for the same product, including black Dacromet, surge, environmentally friendly black zinc, mirror treatment, sandblasting treatment, to do what customers want. We are more willing to use our design engineers with 30 years of experience to provide you with the screws you need and provide various design solutions you want!
