Stainless Steel Bolt Grades

Simple guide to stainless steel fastener grades. Learn the differences between 18-8, 304, 316, and 410 stainless steel bolts and which to use. Learn how to identify the grades of bolts using the markings on the bolt heads and the strength and hardness of common grade bolts.

Find charts for inch steel bolts and metric bolts with different specifications and materials. The grade system for stainless steel bolts runs on two parallel tracks: the ASTM system (common in North America) and the ISO/DIN system (standard in Europe and increasingly global). People often search for the Grade 5 or Grade 8 equivalent in stainless steel, but that specific system does not apply to these alloys.

The classification for stainless steel bolts focuses on both the alloy composition for corrosion resistance and a secondary indicator for mechanical strength. Unlock the secrets of durability with our stainless steel bolt grades chart, your go-to guide for choosing the right fasteners for any project. This stainless steel bolt grades chart shows the main bolt grades, property classes, thread diameter limits, tensile strength, and stress at 0.2% permanent strain for stainless steel fasteners according to ISO 3506-1.

Understanding the markings on stainless steel bolts is crucial for selecting the right fastener for your project. These markings provide valuable information about the bolts material, grade, and manufacturing standards. Compare stainless steel bolt classes (A2-50, A2-70, A4-80, Class 100): head markings, yield and tensile strength, and PSI/MPa.

Download a printable stainless chart (PDF). This guide breaks down the most common stainless steel grades used for fasteners, explains the difference between the 300 and 400 series, and includes a comparison chart you can reference for future projects. Struggling to select the right stainless steel bolts for your project? Compare 304 vs 316, understand ISO A2-70 vs A4-80, and learn how ASTM standards ensure reliability.

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