Flat washers in zinc plated (light and heavy), 304 stainless steel and galvanised (heavy and square), M4 to M20. Washers spread the load under a bolt head or nut and protect the surface you're fixing to.
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From $0.13Heavy Flat Washer Zinc -
From $0.04Light Flat Washers Zinc -
From $0.08304 Stainless Steel Flat Washer -
From $0.14Heavy Flat Washer Galv -
From $0.77Galv Square Washers