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A button head socket cap screw is a type of cap screw with a cylindrical head and hexagonal drive hole. A button head socket cap screw is most commonly driven with an allen wrench or hex key. Yellow zinc plating chromate prevents the zinc from corroding and increases the overall protection of the finish. This finish provides a rainbow or iridescent appearance with dominant yellow tones.
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| Brand | Fastbolt |
| Category | Button Head |
| Outside Diameter (mm) | 4.0 |
| Length (mm) | 20.0 |
| Grade | 10.9 |
| Material | High Tensile |
| Series | Metric |
| Thread Type | Standard |
| Type | Button Head |
| Surface Finish | Yellow Zinc Plated |
| Thread Pitch (mm) | 0.7 |
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