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Interchangeability of Grade 2 and A307A Fasteners. In general, since the minimum strength requirement of a Grade 2 is greater than that of an A307A, a Grade 2 can be successfully utilized in applications where an A307A is specified, as approved by the “Engineer . of Record”.
These alphanumeric designations categorize bolts based on their mechanical properties, such as proof load, tensile strength, and surface hardness. Continue reading as we dive into the basics of bolt grades and their standards, including SAE, ASTM, and metric bolt grades, as well as non-ferrous bolt grades.
Fastener grades tell you the tensile strength, so the higher the number, the stronger the fastener. Bolt grades are shown by the number and pattern of radial lines, dashes or dots on the head. See the graphic below for reference.
11 Σεπ 2023 · There are two main grading systems for bolts: the SAE system and the metric system. SAE system: The SAE system is used in the United States and Canada. The most common SAE bolt grades are 2, 5, 8, and 10. Grade 2: The weakest grade. It is typically used for light-duty applications. Grade 5: A medium-strength grade.
21 Ιουν 2023 · SAE bolt grades and uses. Typical applications of SAE bolt grades include: Grade 2. Low- to medium-strength carbon steel bolts used for non-critical joints: Light construction for wood framing, brackets, or other non-load-bearing applications.
18 Σεπ 2024 · SAE J429, for example, defines grades for bolts based on their strength, which is indicated by radial lines on the bolt head. SAE J429 Grade 2: Low-strength carbon steel with a strength between 60,000-74,000 psi. Ideal for non-critical applications, such as household repairs.
29 Αυγ 2023 · Grade 2: This is the standard grade for bolts with no markings. They have a tensile strength of up to 74,000 PSI for bolts over ¼ inch. Grade 5: Identified by three radial lines, these bolts have a tensile strength of up to 120,000 PSI.
