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USS Flat Washer, 1/2", Galvanized, 25 LB

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HILLMAN FASTENERS 660840 USS Flat Washer, 1/2", Galvanized, 25 LB

Item #: 660840 by Hillman Fasteners

Brand: HILLMAN FASTENERS

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Features

Weight (lb)

25.57

Size (W x H x D)

11.75×6.45×12.80

Product Overview
A USS (United States Standard) flat washer, identified by Hillman Fasteners as mfr code 660840, is designed to distribute the load of a threaded fastener, prevent surface damage, and reduce vibration in bolted connections. These washers feature a larger outside diameter and increased thickness compared to SAE (Society of Automotive Engineers) washers, making them suitable for heavy-duty or structural applications requiring broader load distribution, especially when working with softer materials. This washer is specified for use with 1/2 inch nominal diameter bolts, with an inside diameter ranging from 0.557 to 0.577 inches, an outside diameter between 1.368 and 1.405 inches, and a thickness from 0.086 to 0.132 inches. Constructed from low carbon steel, it features a hot-dip galvanized finish for enhanced corrosion resistance, meeting ASTM A153 specifications and ideal for outdoor, marine, or treated lumber environments. The washer dimensions comply with ASME B18.21.1 Type A Wide Series, Regular standards. It is supplied in a 25-pound bulk quantity.