What Are Grade 2 Bolts Used For?

When tackling a project that involves fastening, choosing the right type of bolt is essential for safety, durability, and performance. Among the various bolt grades available, Grade 2 bolts are one of the most commonly used—especially in everyday applications that don't require high strength or performance.

What Are Grade 2 Bolts?

Grade 2 bolts are made from low or medium carbon steel and are considered ungraded or standard bolts. They're known for being inexpensive, readily available, and easy to work with. Unlike higher-grade bolts, Grade 2 fasteners are typically used where strength isn't the primary concern.

These bolts are often unmarked on the head or may show only a single manufacturer's mark, distinguishing them from stronger bolts like Grade 5 or Grade 8, which have specific head markings.

Common Uses of Grade 2 Bolts

Grade 2 bolts are ideal for non-critical, low-stress applications. You’ll often find them in:

• Home improvement and DIY projects
• Automotive bodywork (e.g., panels, trim—not engine or suspension)
• Furniture assembly
• Woodworking projects
• Light-duty machinery
• Agricultural equipment (for non-load-bearing parts)
• General construction where heavy loads aren't involved

Their affordability and ease of use make them a go-to option for casual or light-duty repairs and installations.

Mechanical Properties

Grade 2 bolts have relatively modest strength:

• Tensile Strength: Approximately 60,000 to 74,000 psi
• Finish: Typically zinc-plated or galvanized to resist corrosion

While suitable for many applications, these bolts are not designed to withstand significant stress, torque, or vibration.

When Not to Use Grade 2 Bolts

Despite their wide use, Grade 2 bolts are not appropriate for high-stress or critical load-bearing applications. Avoid using them in:

• Structural assemblies
• High-torque machinery
• Automotive engine or suspension components
• Aerospace or industrial equipment

For these applications, higher-grade bolts like Grade 5 or Grade 8—with significantly higher strength ratings—are more appropriate.

Conclusion

Grade 2 bolts offer a reliable and affordable solution for many light-duty tasks, particularly in household, automotive, and general-purpose construction settings. However, understanding their limitations is key to using them safely and effectively.

Always match your bolt grade to the demands of your project—and when in doubt, consult a hardware specialist or engineer to ensure you're using the right fastener for the job.