The thickness of the color zinc passivation film is 8-15μm, the salt spray test is more than 72 hours, and the appearance is rainbow-colored. When trivalent chromium passivation is used, the environmental protection performance is excellent.

The head is a cross-groove countersunk design, which can be hidden in the installation surface to keep the surface flat. The drill bit diameter matches the thread diameter (such as ST4.2 drill bit diameter 4.2mm), which complies with GB/T 15856.1-2002 standard.

Through the black passivation liquid treatment containing silver salt (c2D), a 10-15μm coating is formed, and the salt spray test is more than 96 hours. Environmentally friendly black zinc plating uses trivalent chromium passivation, does not contain hexavalent chromium, and complies with RoHS standards.

Rainbow chromate passivation (c2C) on the basis of electrogalvanizing, coating thickness 8-15μm, salt spray test for more than 72 hours. When using trivalent chromium passivation process, it complies with RoHS environmental protection directive, and the hexavalent chromium content is ≤1000ppm.

Made of 1022A carbon steel, the surface hardness reaches HV560-750 after heat treatment, and the core hardness reaches HV240-450. The surface is electro-galvanized to form a 5-12μm coating, which meets the GB/T 13912-2002 standard, and the salt spray test reaches 24-48 hours without white rust.

Same as electrogalvanized embedded plate, using Q235 or Q355 carbon steel, steel plate thickness 8-50mm, anchor bar diameter 10-32mm, in line with GB/T 700 standard.

Q235 or Q355 carbon steel, the thickness of the steel plate is usually 6-50mm, the diameter of the anchor bar is 8-25mm, in line with GB/T 700 or GB/T 1591 standards.

Through the black passivation liquid treatment (c2D) containing silver salt or copper salt, a black passivation film is formed with a thickness of about 10-15μm. The cost is high but the appearance is unique.

Use colored zinc passivation (c2C), coating thickness 8-15μm, salt spray test can reach more than 72 hours, colorful appearance, better anti-corrosion performance.

GB/T 882-2008 “Pin” standard, nominal diameter 3-100mm, materials include carbon steel, stainless steel, etc., electrogalvanized layer thickness 5-12μm, in line with c1B or c1A post-treatment requirements.

The color zinc passivation process (c2C) is adopted, the coating thickness is 8-15μm, and the corrosion resistance of the salt spray test is more than 72 hours, which has both anti-corrosion and decorative functions.

It consists of countersunk bolts, expansion tubes, flat washers, spring washers and hexagonal nuts. The material is mostly carbon steel (such as Q235), and the thickness of the electrogalvanized layer is 5-12μm, which meets ISO 1461 or GB/T 13912-2002 standards.