Colored zinc-plated cross countersunk drill thread
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.
Electrogalvanized cross countersunk drill thread
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.
Black zinc-plated hexagonal drill tail wire
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.
Colored galvanized hexagonal drill tail wire
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.
Electro-galvanized hexagonal drill thread
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.
Drill thread series
Our company mainly produces and sells various power bolts, hoops, photovoltaic accessories, steel structure embedded parts, etc.
Please leave us a message
-
-
-
WeChat
