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Also known as plain washers, their purpose is to distribute the fastener's load while reducing heat and friction during the tightening process. They can also be used as spacers. Black Japan is a lacquer or varnish suitable for many substrates but known especially for its use on iron and steel. Its high bitumen content provides a protective finish that is durable and dries quickly.
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| Product properties | |
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| Brand | Fastbolt |
| Category | Bright |
| Inside Diameter (mm) | 6.4 |
| Outside Diameter (mm) | 12.5 |
| Width (mm) | 0.8 |
| Grade | 4.8 |
| Material | Mild Steel |
| Series | Metric |
| Type | Bright |
| Surface Finish | Black Japan |
| Size (mm) | 6 |
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