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Chipboard screws are self-tapping screws most commonly designed with a single thread that runs all the way from the base of the head to the tip. Pozidriv head design ensures screwdriver head does not cam-out. 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 | Chipboard |
| Outside Diameter (mm) | 4.0 |
| Length (mm) | 25.0 |
| Grade | 4.8 |
| Material | Mild steel |
| Series | Metric |
| Type | Chipboard |
| Surface Finish | Black Japan |
| Screw Drive | Pozi |
| Head Design | 4 Rib |
