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3/8-inch USS flat washers - $15 (Ronkonkoma)
856 Johnson Ave
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Material: Low-carbon steel (meets ASTM F844 for mechanical properties).
Finish: Zinc-plated (per ASTM F1941) for moderate corrosion resistance in indoor or mildly exposed environments; not ideal for harsh outdoor/marine use (opt for HDG or stainless instead).
Pattern: USS (Type A narrow series)—wider bearing surface for load distribution, vibration resistance, and preventing pull-through in wood or composites.
Design: Flat, circular disc with central hole; acts as a spacer to protect surfaces and allow for slight misalignment.
Performance: Supports general-purpose loads; compatible with Grade 2 A307 bolts, lag screws, and threaded rods. Tolerances per IFI standards may vary slightly by batch.