Grade 2 fasteners are low-strength fasteners typically made from low carbon steel, offering basic mechanical properties suitable for general-purpose applications. These fasteners are often used in non-critical, low-stress environments where high strength and load-bearing capacity are not required.
Key Characteristics of Grade 2 Fasteners:
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Material Composition: Made from low carbon steel, which is not heat-treated, resulting in lower strength compared to higher-grade fasteners.
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Mechanical Properties:
- Tensile Strength: Approximately 60,000 psi (414 MPa), making them suitable for light-duty applications.
- Yield Strength: Around 36,000 psi (248 MPa), indicating they can handle basic loads but are not suitable for high-stress applications.
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Corrosion Resistance: Grade 2 fasteners generally have limited corrosion resistance. They are often available with zinc or other coatings to provide basic protection against rust but are not recommended for use in highly corrosive environments.
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Applications:
- Used in general household repairs, non-critical mechanical assemblies, furniture, and light construction.
- Suitable for wood, plastic, and some soft metals where high strength is not required.
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Identification: Grade 2 fasteners typically have no specific markings on the head, which distinguishes them from higher-strength fasteners that have lines or other marks.
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Standards Compliance: They conform to ASTM A307 and SAE J429 specifications for low-strength bolts and fasteners.
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Magnetic Properties: Magnetic due to their steel composition, which is common for carbon steel fasteners.
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Cost-Effectiveness: Grade 2 fasteners are economical and readily available, making them a popular choice for basic applications where cost is a key consideration.
Grade 2 fasteners are ideal for light-duty tasks and are valued for their affordability and availability, though they should not be used in structural or critical applications requiring higher strength and reliability.