1/4"-20x1/2" Grade 2 Hex Head Cap Screw

Hex Head Cap Screw - Grade 2 
1/4" to 3/4", 6" and shorter
Rockwell Hardness - B80 to B100
Proof Load Strength - 55,000 psi
Minimum Tensile Strength - 74,000 psi

1/4" to 3/4", longer than 6" 
or Over 3/4" to 1-1/2"
Rockwell Hardness - B70 to B100
Proof Load Strength - 33,000 psi
Minimum Tensile Strength - 60,000 psi

Grade 2 fasteners with clear zinc Cr3 plating are made from low-carbon steel, offering moderate tensile strength (74,000 psi) ideal for light-duty applications. The addition of clear zinc Cr3 plating enhances the fasteners' performance by providing an environmentally friendly protective layer. This plating process uses chromium-free (Cr3) technology, which replaces traditional hexavalent chromium (Cr6) plating. The result is a thin, clear, and corrosion-resistant layer that does not alter the fastener's mechanical properties, such as its strength or thread integrity.

The benefits of clear zinc Cr3 plating are significant. One of the primary advantages is its improved corrosion resistance. The clear coating effectively protects the fastener from rust and environmental degradation, making it ideal for use in mildly corrosive environments. This makes clear zinc-plated Grade 2 fasteners suitable for light outdoor applications or industries where some level of corrosion resistance is necessary but where the environmental impact of Cr6 plating is a concern.

Another benefit of Cr3 clear zinc plating is its environmental friendliness. Unlike traditional Cr6 plating, which contains hexavalent chromium—a toxic substance with environmental and health risks—Cr3 plating uses a chromium-free process, which is safer for both workers and the environment. This makes it a more sustainable choice for manufacturers and companies adhering to stricter environmental regulations.

The clear, aesthetically neutral finish of Cr3 plating also preserves the fasteners' appearance, as it does not alter the appearance of the steel underneath. This is beneficial for applications where visual appearance is important but without the bright yellow or blue hues seen in other types of plating.

Overall, Grade 2 fasteners with clear zinc Cr3 plating provide an optimal balance between performance, environmental responsibility, and cost-effectiveness, making them a reliable choice for light-duty applications in various industries.