A square screw head is commonly known as a Robertson screw head.
A flash head is a removable flash that comes as an accessory to some cameras.
The end of a screw is called the "head." It is the part that is turned to drive the screw into a surface. Some common types of screw heads include flat head, round head, and hex head.
The screw head is larger to prevent the screw from pulling threw the hole made by the shaft
An Allen screw is a screw whose head has a hexagonal socket.
To choose the best screwdriver for a screw with a tapered head, look for a screwdriver that matches the size and shape of the screw head. A screwdriver with a tapered tip or a flathead screwdriver may work best for this type of screw. Make sure the screwdriver fits securely in the screw head to avoid stripping or damaging the screw.
That would be a "phillips" heades screw.
To remove a hex screw, you will need a hex key or Allen wrench that matches the size of the screw head. Insert the hex key into the screw head and turn it counterclockwise to loosen and remove the screw.
To remove a screw with no head from plastic, you can try using a pair of pliers or a screw extractor tool. Grip the screw tightly with the pliers or insert the screw extractor into the screw and turn it counterclockwise to loosen and remove it from the plastic.
A Phillips head screw typically requires less effort to use than a flat head screw, as the design allows for the screwdriver to securely fit into the screw head, reducing the risk of slipping.
To remove a stripped screw head, you can try using a rubber band or a screw extractor tool to grip the screw and turn it counterclockwise. Another method is to use a rotary tool to create a new slot in the screw head for a flathead screwdriver to grip onto.
The IMA (ideal mechanical advantage) of a screw is determined by the ratio of the circumference of the screw head to the pitch of the screw thread. The formula for calculating IMA is 2πr/p, where r is the radius of the screw head and p is the pitch of the screw thread.