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Common model analysis of screwdriver
Screwdrivers come in various models, and while the most common types are the flat-head (slotted) and the cross-head (Phillips), there are many more designs available. It's important to note that screwdrivers do not have round heads because they wouldn’t provide any grip or torque. The flat-head design ensures a secure fit, while the cross-head allows for more even distribution of force, reducing the chance of stripping the screw.
Screwdrivers can be categorized into manual and electric versions based on their power source. When it comes to the tip shape, there are two main types: flat-head (also known as slotted) and Phillips (cross). These tools come in a wide range of sizes and specifications. In industry settings, they are usually measured using either metric (in millimeters) or imperial (in inches) units. For example, metric sizes might be labeled as 3mm, 5mm, etc., while inch-based sizes could be 1/4", 3/16", and so on.
Flat-head screwdrivers are typically labeled with dimensions like width × length. For instance, "3×75mm" means the blade is 3mm wide and the shaft is 75mm long (not including the handle). On the other hand, Phillips screwdrivers are often marked by the tip size followed by the shaft length, such as "2#×75mm." Some manufacturers use "PH2" instead of "2#", but both refer to the same size. The thickness of the shaft can give a rough idea of the tip size, but the actual classification is based on the cutter head itself. Common sizes like 0#, 1#, 2#, and 3# correspond to shaft diameters of approximately 3.0mm, 5.0mm, 6.0mm, and 8.0mm respectively.
High-quality screwdrivers are made with spring steel for the tip, which provides a good balance of hardness and durability. A good screwdriver should be hard enough to maintain its shape but not so brittle that it breaks easily. If the screw slot becomes worn, you can gently tap the screwdriver with a hammer to deepen the slot, making it easier to remove the screw. Additionally, screwdrivers need to be tough enough to withstand bending without breaking. Ideally, the tip should have a hardness greater than HRC 60 and resist rusting. Many high-end models also feature aluminum handles for better grip and comfort.