A mechanical pencil is a pencil that has a replaceable pigment core and can be mechanically stretched. When the front section of the refill is worn, it can be extended outward. The lead core is not fixedly connected to the outer casing, and the lead core is usually made of graphite. Of course, other color pigments and lead cores of other materials are also used. However, what if the automatic pencil refill is stuck? How to choose a mechanical pencil, then let me introduce you to the small series: Â Â Â Â Â In China, the hardness of pencil refills has been divided into eighteen levels from the softest 6B to the hardest 10H. Among the 18th grades, 4B to 2H are writing pencils suitable for general study and office use, among which HB pencils are moderately soft and moderately used. Â Â Â Â Â 2H to 7H is a hard core pencil suitable for engineering painting and multi-layer rewriting; 8H, 9H, 10H are the hardest pencils for refills, suitable for use in various production records, woodworking drawings, etc. 2B, 3B are black core pencils, suitable for painting and engineering drawing deepening; 4B, 5B, 6B are suitable for drawing pictures and sketches. Â Â Â Â Â There are three types of automatic pencils: rotary, swaying and rotating. What should I do if the automatic pencil refill is stuck? The correct method is to first pay attention to the appearance of the automatic pencil, whether there is crack, with or without burrs, if the appearance is not faulty, you can try whether the lead is flexible. Once the tail cap is shaken, the three-jaw chuck will open, driving the lead to move forward, and it should feel relaxed when it is shaken. Each time it is swayed, the core output is 0.5~1 mm, and each lead core is 60 mm long. It should also be equipped with a floating core tube, which can protect the lead core and not stick to other things. Â Â Â Â Â How to do the automatic pencil refill stuck, how to buy pencils and automatic pencils. I believe you have some understanding here, I hope to help you. Leather Sofa Bed,Collapsible Sofa Bed,Sofa Recliner Leather,Sectional Sofa Bed Kaifeng Lanwei Smart Home Co., Ltd , https://www.sofawickles.com