Hardware knowledge: common models and classification of screwdrivers
What are the common models of screwdrivers? In general, the common ones are the word and the cross. But the screwdriver model is more than these two. But one thing is certain, the screwdriver has no round head because the round head is not twisted at all. The word is to ensure that there is a twist, and the cross can make the power more evenly distributed. The screwdriver is divided into a manual screwdriver and an electric screwdriver according to the power source. According to the batch head or the cutter head, there is a word (FLATHEAD) and a cross (PHILLIPS). There are many specifications and models. In the industry, it is basically based on the batch. It has two sizes. One is metric, which is what we often say in MM. Let's say those sizes upstairs. There is also an inch system, it is in inches, such as 1/4, 3/16, this number is 25 is the metric size. 1. The model number of the flat-blade screwdriver is expressed as the width of the cutter bar × the cutter bar. For example, 3×75MM means that the cutter head width is 3MM and the rod length is 75MM (not full length). 2. The model of the Phillips screwdriver is expressed as the size of the cutter head × the cutter bar. For example, 2#×75MM means that the cutter head is No. 2 and the metal rod length is 75 mm (not full length). Some manufacturers use PH2 to indicate 2#, which is actually the same. You can roughly estimate the size of the cutter head by the thickness of the cutter bar, but the industry is distinguished by the size of the cutter head. The metal rods corresponding to the models 0#, 1#, 2#, and 3# are approximately 3.0 mm, 5.0 mm, 6.0 mm, and 8.0 mm. The head of a high quality screwdriver is made of spring steel with a relatively high hardness. A good screwdriver should be hard but not brittle. When the screw head opening becomes bald and slippery, you can use a hammer to tap the screwdriver, and the slot of the screw is deeper, so that the screw can be unscrewed. The screwdriver is often used to pick up things, and it requires a certain degree of toughness. Bend is not folded. In general, it is desirable that the hardness of the head of the screwdriver is greater than HRC60 and it is not easy to rust. Aluminum plate points.
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