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3. Tapered or Flat Underheads The design of the underhead can vary. A flat underhead ensures even pressure distribution, while a tapered design can help in locking the bolt in place, reducing the likelihood of loosening under dynamic loads.

- Furniture Assembly In woodworking, countersunk screws help create smooth, clean surfaces without visible fastener heads, which is critical for high-quality furniture.

1. Material and Coating Fasteners should be made from materials that resist corrosion and wear, especially if the finished product is subjected to moisture. Coated fasteners, such as zinc or epoxy-coated, can offer additional protection.