What is the ASTM standard for high-strength washers?

The ASTM standard for high-strength washers is F436. This standard specifically covers the requirements for hardened, high-strength washers that are designed to be used with high-strength bolts, particularly in structural applications. The use of such washers is critical in ensuring that the bolt connections maintain their integrity under load, as they help distribute the load over a larger area and minimize the risk of bolt failure or loosening.

The emphasis on high-strength washers outlined in ASTM F436 relates to their dimensional specifications, material properties, and manufacturing processes, ensuring that they provide adequate support and performance in structural applications. This makes F436 essential for applications involving bolted joints where high strength and reliability are necessary.

In contrast, the other options pertain to different aspects of fastener technology or standards that do not focus specifically on high-strength washers. F844 covers flat washers used with bolts and screws but does not delineate the requirements for high-strength washers. F2170 pertains to the measurement of relative humidity during concrete curing, while F606 relates to the testing methods for mechanical properties of fasteners. Thus, ASTM F436 is clearly the standard associated with high-strength washers, making it the correct choice in this context.