A Guide to Stainless Steel Bolt Grades

Last Updated on March 13, 2023 by Marsh Fasteners

Stainless steel bolts are a revolutionary invention in our modern world. The product has made an amazing impact on construction, engineering and many other thriving industries.

Engineers found that a small addition of Chromium, as well as few other materials, made steel alloys highly resistant to corrosion. This discovery in turn made a substantial improvement with regard to the structural integrity of various projects and applications subject to corrosion.

As industry experts we’d like to offer some insight into why stainless steel bolts are created in accordance to grading specifications.

Austenitic Stainless Steel Bolts – 302 to 316 Stainless Steel

The austenitic family of steels is utilized due to their naturally high levels of chromium. This means fewer materials need to be added to achieve the ideal corrosion resistance ratio. The Nickel in austenitic steel also offers high durability against physical strain before fracturing. However, despite the increased strength, it can be comparable to a grade 2 or 3 steel and will never be as strong as grade 5 hardened steel.

Martensitic Stainless Steel Bolts – 410 and 416 Stainless Steel

The martensitic family of steel offers greater strengths, but at the cost of lower corrosion resistance. Therefore, projects that are subject to minimal corrosion would ideally benefit from the martensitic group of stainless steels.

If you need further insight into the world of stainless steel bolts, stainless steel threaded rods or marine fasteners, simply contact Marsh Fasteners today and speak with our friendly and knowledgeable consultants today.

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