Zinc Chromate Plated Bolts

Steel bolts vary under the test with some bolts lasting only three hours.

Zinc chromate plated bolts.

This additional layer passivates the zinc and protects it from white rust. Yellow plated bolts have to last 600 percent longer before red rust can appear during the same test. For fasteners that need high corrosion or abrasion resistance a chromate conversion coating is applied over the zinc plating for additional resilience. Yellow zinc plated 52.

Anoop if you use the torque equation t kdp as explained on our torque page the friction coefficient for zinc plated bolts is 0 22 vs 0 25 for galvanized. Safer trivalent chromium coatings are becoming. Fasteners are used for fastening and securing materials such as wood metal plastic or concrete. This is a secondary dipping process used on zinc or cadmium plated fasteners.

Well zinc can still corrode but it corrodes at a significantly slower rate than other metals and alloys. Standard clear chromate leave a bluish white hue. As with cadmium this material is toxic and its use is decreasing. It increases corrosion resistance and can be colored.

The clear zinc bolts are required to remain rust free during a salt spray test. Whether a screw is galvanized or zinc plated it will feature a zinc shell. Therefore zinc serves as a protective barrier for screws. They include nuts and bolts threaded rods structural bolts machine screws wedge anchors washers rivets and more in a variety of types and sizes including metric and inch.