| 摘要 |
A novel plastic fastening device is provided herein, which mainly contains a bolt, a nut, and at least a washer. On the surface of the washer that interfaces with the object being fastened, a number of small wedges are arranged radially with equal spacing therebetween. Inside at least one of the small wedges, a plate is embedded vertically with a saw-toothed edge facing towards the object being fastened. When the bolt and nut are screwed together and the small wedges on the washer are pressed against the object, the pointed edges of the small wedges are deformed, and the saw teeth of the embedded plate is exposed and driven into the object for a superior fastening effect.
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