All About Bolts: Ferrous or Non-Ferrous?

Bolts can be either ferrous or non-ferrous, meaning that they either contain iron (ferrous) or don’t contain iron (non-ferrous). So what’s the difference between the two, and what are the characteristics of each?

Obviously, the biggest difference is that ferrous bolts contain iron, while non-ferrous bolts do not. Ferrous metals are magnetic, and are also more vulnerable to corrosion and rust in outdoor environments. Non-ferrous metals tend to be significantly lighter that ferrous metals, which can be seen in the weight difference between materials like aluminum, copper and brass (non-ferrous) versus carbon steel (ferrous).

Ferrous metals, and the bolts made from them, are traditionally stronger and less expensive than their non-ferrous counterparts. Non-ferrous metals, and the bolts made from them, have a lower density, are non-magnetic, and are colorful or able to be made colorful.

Some examples of ferrous metals include non-alloy steels, stainless steel, low, medium and high carbon steel, and some alloy steels, such as chromium and nickel. Examples of non-ferrous metals include copper, aluminum and zinc.

All these factors affect what bolts you should choose for your application. Looking for super-durable, low-cost bolts? Maybe carbon steel bolts would be best for you. In need of something very light and corrosion-resistant? Then look for a bolt in the non-ferrous material family.

If you still have questions about ferrous versus non-ferrous bolts, China Special Fasteners is here to help. Contact us for more information from one of our knowledgeable fastener experts.

Carbon steel anchors (ferrous)

Purple aluminum hex cap screws (non-ferrous)