Screws, Bolts & Nails

Self-tapping screws are designed to cut their own threaded holes in hard materials. This means that they can create their own threads as they are being driven into the material, eliminating the need for pre-drilling a hole. This makes them ideal for use in hard materials such as metal or plastic where it may be difficult to create a threaded hole using traditional screws. Additionally, self-tapping screws provide a secure and tight fit, ensuring that the screw remains in place even under heavy loads or vibrations.

A split die is a type of cutting tool used for creating external threads on cylindrical workpieces. It consists of two halves that can be opened and closed, allowing it to be easily placed onto the workpiece and removed after the threading operation is complete. The split die is commonly used in applications where the workpiece cannot be easily threaded using a traditional solid die.

The correct answer is Cross, Countersunk & Slotted, Round & Slotted. These are three different types of screw heads commonly used in various applications. The Cross head, also known as Phillips head, has a cross-shaped recess and is designed to be used with a Phillips screwdriver. The Countersunk & Slotted head has a flat top surface with a single slot for a flathead screwdriver. The Round & Slotted head has a rounded top surface with a single slot for a flathead screwdriver. These screw heads offer different advantages and are used in different situations depending on the specific requirements of the project.

Threading is the process of fastening machine screws and bolts into a metal or plastic object without the need for nuts. This method allows for a secure and reliable connection between the screws/bolts and the object, eliminating the need for additional components like nuts.

Screws and bolts can be easily removed and reused, while nails are designed to be permanent and difficult to remove without causing damage. This is because screws and bolts have threaded shafts that can be screwed into or out of a material, allowing for easy installation and removal. Nails, on the other hand, have a smooth shaft that is hammered into the material, creating a tight and permanent hold.

The disadvantage of using nails instead of screws is that nails can only be used in wood or wooden products. This limits their versatility and makes them unsuitable for use in metals or plastics. Screws, on the other hand, can be used in a variety of materials including metals, plastics, and wood. Therefore, nails are not as versatile as screws when it comes to their applications.