The specification for flat circular washers requires compliance with which standard?

The correct standard for flat circular washers is ASTM F436. This specification outlines the requirements for flat washers that are used in conjunction with high-strength bolts, nuts, and washer assemblies, ensuring that these components maintain structural integrity and performance under load. ASTM F436 specifically addresses aspects such as material properties, dimensions, and tolerances that are critical for the effective functioning of washers in bolted connections.

While other standards like A563, ASTM A325, and ASTM A490 pertain to related components—such as nuts and bolts of various grades—ASTM F436 is distinctly focused on washers. Understanding the specific standards relevant to each bolting component helps ensure the proper selection and application of materials in structural steelwork, which is vital for meeting safety and performance criteria in construction projects.