Open-end wrenches, also known as open-end wrenches, are mainly divided into double-ended open-end wrenches and single-ended open-end wrenches. Its role is very extensive, mainly used in mechanical maintenance, equipment, home decoration, automobile repair, etc. Open end wrenches have fixed-size openings at one or both ends. The opening size is compatible with the size of the screw head and nut, and is made according to the standard size. So do you know what are the specifications of open-end wrenches?
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　 Open end wrench specifications
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Model specifications of double-end open wrench (in MM): 4 × 5, 5.5 × 7, 8 × 10, 9 × 11, 12 × 14, 13x15, 14 × 17, 17 × 19, 19 × 22, 22 × 24, 30 × 32, 32 × 36, 41 × 46, 50 × 55, 65 × 75 and so on. The open-end wrench used for the external hex corresponds to the hex nut more accurately, because there are hex head bolts and small hex head bolts. Commonly used open-end wrench specifications range from 7 to 65; corresponding thread specifications are M4, M5, 27--M18, 30--M20, 65--M42, etc. The minimum specification for a full set of allen wrenches is 3, so be sure to make a good choice when buying.
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　 Use of open-end wrench
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The double-ended open-end wrench is a general-purpose tool, and is a hand tool necessary for assembling machine tools or spare parts as well as transportation and agricultural machinery maintenance. The manufacturing material of double-ended open-end wrenches is generally selected from high-quality carbon steel forged and processed by integral heat treatment. Products must pass quality inspection and verification to avoid personal injury caused by product quality problems during use. Single-end open-end wrenches for large-scale industries are suitable for petroleum, chemical, metallurgy, power generation, oil refining, shipbuilding, petrochemical, machinery and other industries. The tapping open-end wrench is suitable for industries such as petroleum, chemical industry, metallurgy, power generation, oil refining, shipbuilding, petrochemical, etc. It is an essential tool for equipment maintenance and repair work. High-neck open-end wrenches are mainly suitable for occasions where the working space is narrow and ordinary wrenches cannot be used. The rotation angle is small, it can be used where there is only a small swing angle (just turn the wrench 1/2 rotation angle), and because of the large connection surface, it can be used for strong tightening.
The above content is related knowledge about the specifications and usage of open-end wrenches introduced to friends. Different open-end wrenches have different sizes. Therefore, before buying a wrench, we must first understand the model specifications of different wrenches, in order to buy a suitable wrench. I hope that the contents of the open-end wrench specifications and models described above will provide a reference for everyone when choosing a wrench.
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