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.
Cross countersunk drill thread series
Our company mainly produces and sells various power bolts, hoops, photovoltaic accessories, steel structure embedded parts, etc.
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