Iron + truss small screw trivalent chromate black color
The head shape resembles the upper part of a sphere. Due to its larger outer diameter compared to other heads, it allows for a wider contact area on the seat surface. It is compliant with EU-RoHS standards.
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basic information
Size range: M2-M6
Price information
Delivery times vary depending on the quantity. Same-day shipping is possible at the earliest. Please feel free to contact us.
Delivery Time
※Delivery times vary depending on the quantity. Same-day shipping is possible at the earliest. Please feel free to contact us.
Applications/Examples of results
Steel is widely used as a material for screws due to its easy availability, strength, and toughness. Based on carbon steel, which primarily consists of iron (Fe) and carbon (C), alloy steels with added elements such as chromium and molybdenum are used, depending on the application in terms of shape, strength, and corrosion resistance, often after undergoing heat treatment. Trivalent chromate is a surface treatment that serves as an alternative to chromate plating, providing corrosion resistance equal to or greater than traditional chromate treatment without containing harmful hexavalent chromium. Additionally, it can control the decrease in corrosion resistance that occurs during heating, which is a drawback of chromate treatment. In recent years, there has been a growing global awareness of environmental measures, leading many industries, including automotive and semiconductors, to consider alternative treatments to hexavalent chromium, with trivalent chromate being used as a substitute for chromate plating. On the other hand, compared to chromate treatment, managing the process conditions such as the stirring state of the plating material, immersion time, temperature, and pH can be challenging, which may result in uneven appearance and color finish. Furthermore, in general chromate treatments, the color may change as corrosion begins.
Company information
Wilco sells various fastening components, including screws, as well as professional tools. Please feel free to contact us regarding custom products, custom processing, and the issuance of various certificates and documents related to other products.