TECHNICAL SUPPORT
Published 2026-03-20
When making robots or making small inventions, the biggest fear is that the drawings are beautiful, but the parts cannot be installed when you buy them. Especially for key components likeservos, even if the size differs by just one millimeter, the entire structure may have to be torn down and rebuilt. Today I will talk to you about the most commonly used SG90servo, how to read its parameters, how to know its size, and how to avoid pitfalls.
Although SG90 is called a 9-gramservo, you need to know its exact length, width and height. Its standard size is roughly 23mm x 12.2mm x 29mm, but this data can only be used as a reference. Because SG90s produced by different manufacturers may have slight differences in the position and thickness of their ears (that is, the mounting holes). If you are designing 3D printed parts or CNC parts, it is best to obtain the physical object first, or find the accurate drawings provided by the store you purchased from to check.
In addition to paying attention to its appearance, you must also understand the key parameters. Its working voltage is usually in the range of 4.8V to 6V. When it is at 4.8V, the torque is about 1.2 - 1.6 kg·cm. What is this concept? That is to say, at the end of the 1 cm long rocker arm, it can lift 1.2 to 1.6 kg of items. This kind of torque is enough to drive a small robotic arm or steering mechanism. Its rotation speed is about 0.1 seconds/60 degrees, and the response is quite fast. Keep in mind that these are typical values, and you will need to check the label of your servo for specific conditions.
In many application scenarios involving SG90 servo, accurately obtaining its dimensional drawing is a very critical step. However, many people often get confused and don't know how to find the SG90 servo dimensional drawing. Should you search carefully in the product manual, search on a professional electronic component website, or consult with technical experts in related fields? These are all directions worth thinking about. Each approach may help us find the crucial dimensional drawing, so as to better carry out the design, installation and other work related to the SG90 steering gear.
If you search for "SG90 drawings" on the Internet, a large amount of related content will appear. However, the quality of these drawings varies. The safest and most reliable way is to go to the store page where you purchased the servo. Usually, the product details will come with drawings in PDF or CAD format. If the store does not provide such drawings, you can go to the official website of the major steering gear manufacturer to search for them, or visit some open source hardware communities, such as the wiki page of , which often has accurate engineering drawings for you to download for free.
️Step one: First, clarify your installation space. Carefully use a caliper to measure the reserved position of your device, and carefully compare it with the dimensional chart to see if the device can be inserted smoothly. During this process, you need to pay special attention to the mounting holes on the "ears" of the servo, make sure whether they use M2 or M3 screws, and also know the specific hole spacing.
️Step 2: Check the rocker arm specifications carefully. Products such as SG90 are usually equipped with several different styles of rocker arms, such as cross-shaped rocker arms and disc-shaped rocker arms. You need to carefully confirm the number and diameter of the teeth to see if they can match your connecting rod or wheel. If it doesn't match, you will have to polish it yourself after buying it, which will be a very troublesome process.
This question is the most frequently asked. To be honest, it belongs to the category of micro servos, and its power has certain limitations. Apply it to the steering control of a car, the pan/tilt control of a small camera, or the joints of a light manipulator, and it is fully capable without any problems. However, if you plan to use it to lift heavy objects, or place it in a place where it needs to withstand strong impacts, then it will be unable to achieve the desired effect, and may even be burned out. The judgment method is actually very simple: first estimate the strength required by the structure, leave a margin of 1.5 times, and then make selection based on this result.
When installing the SG90, there are many points that require special attention. First, carefully check whether the installation environment meets its requirements, including space layout, temperature, humidity and other conditions, to ensure a suitable and stable initial installation foundation for SG90. Secondly, the tools and accessories involved in the installation must be prepared in advance and ensure their quality, so as to avoid problems with the tools or accessories affecting the installation process and effect. Furthermore, during the installation process, the detailed installation instructions must be strictly followed. Every link must be executed accurately without any sloppiness to ensure that the SG90 can be installed correctly and stably.
In addition, after the installation is completed, a comprehensive and detailed inspection is required. Check whether each connection part is firm and whether there is any sign of looseness to prevent unstable connections during subsequent use. At the same time, a preliminary test was conducted on the overall operating status of the SG90 to see whether it can respond to various instructions normally, to ensure that the installed equipment can be put into use smoothly, and to avoid potential problems caused by careless installation that affect its normal functions.
When installing the servo, do not tighten the screws as soon as you come up. First, place the servo accurately in the appropriate position, then gently turn the rocker arm manually, and carefully check to ensure that it can move freely and flexibly throughout the entire travel range, and will never be stuck by the housing. Be more careful when making electrical connections. Normally, the red wire represents the positive pole, the brown wire represents the negative pole, and the orange or yellow wire is the signal wire. Once connected reversely, the servo will be burned immediately. When debugging the program, first let the servo return to the neutral position (about 1.5ms high-level pulse), and then install the rocker arm. This can avoid a lot of unnecessary trouble.
When you are using the SG90 servo, have you ever encountered a "rollover scene" with various situations caused by size issues? Come to the comment area to speak freely, share your experience, and give everyone a warning to avoid similar situations from happening again! If you think these sharings are useful to you, don’t forget to like and share them so that more friends can see these valuable experiences.
Update Time：2026-03-20
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