A screwdriver is a tool used to twist a screw to force it into place. It usually has a thin wedge-shaped head that can be inserted into the slot or notch of the screw head - Beijing-Tianjin-Hebei and Shaanxi-Western dialects are called "blind cones", Anhui, Henan and Hubei are called “startersâ€, the central and western regions are called “changing knivesâ€, and the Yangtze River Delta region is called “screwingâ€. There are two main types (negative sign) and cross (positive sign). Also common are hex screwdrivers, including both internal and external hex.
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 flat head and a phillips.
There are many specifications and models. In the industry, it is basically based on the batch head. It has two sizes. One is metric, which is what we often say in MM. For example, upstairs. The size of the talk. There are also English, 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 head*. For example, 2 x 75 mm means that the width of the cutter head is 2 mm and the length of the rod is 75 mm (not full length).
2. The model of the Phillips screwdriver is expressed as the size of the cutter head*. For example, 2#×75mm means that the cutter head is No. 2 and the metal rod is 75 mm long (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# have a thickness of 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.
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Label: Screwdriver model resolution
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