Maya Ellison
USB ports have a plastic piece inside them that maintains pressure between the contacts when a USB cable is plugged in. This piece also ensures that the cable is oriented correctly and cannot be inserted backwards or upside down. While USB ports can still function without this plastic piece, it is important to note that its absence may cause the USB connectors to become loose. In such cases, users have suggested using adhesives like Blu Tack or acrylic caulk to secure the plastic piece back into place. If the plastic piece cannot be reattached, it is recommended to disable the port to prevent any potential short circuiting or safety hazards.
| Characteristics | Values |
|---|---|
| Name of the plastic piece inside USB ports | The USB specification doesn't give it a name, but it can be called the "USB type A receptacle contact support tang" or "key" |
| Function | Maintains pressure between contacts when a USB cable is plugged in and enforces proper orientation of the USB cable |
| Repairability | The plastic piece cannot be replaced or repaired. To repair a USB port with this part missing, the entire USB connector must be desoldered from the PCB, which is a difficult process that should be left to an expert |
| Durability | Plastic USB connectors may be less durable than metal ones, but newer formulations of plastic may be stronger |
| Removal of plastic fragments | Blu Tack can be used to remove plastic fragments stuck inside a USB port without causing damage |
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What You'll Learn
The plastic part of a USB port is called a 'tang' or a 'key'
USB ports are used to charge devices and connect peripherals like keyboards, mice, and printers. The plastic part of a USB port that some users have accidentally removed is not necessary for the port to function. However, it serves an important purpose: it maintains pressure between contacts when a USB cable is plugged in, and it ensures the proper orientation of the USB cable so that it cannot be inserted the wrong way. This plastic piece is called a "tang" or a "key" by some users, but the USB specification does not give it an official name. If this part breaks off, the USB port will still work, but connections may be loose.
The plastic piece inside a USB port is not replaceable. If it is missing, the entire USB connector must be desoldered from the PCB to repair the port. This requires good tools and technique to avoid damaging the PCB. Some users have suggested using "Krazy Glue" to reattach the piece, but others warn of the risk of short-circuiting or fire if the contacts move and short out. To prevent this, one user recommends disabling the port completely by plugging it.
USB ports are designed to be durable, with standard USB connectors having a minimum rated lifetime of 1,500 cycles of insertion and removal. The connectors are also designed to be hot-swappable, meaning they can be connected and disconnected while the device is powered on. This convenience, however, may lead to users handling the connectors with less care. To improve durability, a locking device was added, and a leaf spring was moved from the jack to the plug so that the cable bears the most wear.
In addition to the plastic tang, the electrical contacts in a USB connector are protected by an adjacent plastic tongue. This plastic tongue may be part of the plastic housing that covers the entire connecting assembly. The plastic housing helps users identify the correct orientation for plugging in the connector, as USB-A and USB-B connectors are not rotationally symmetrical.
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The tang/key is not replaceable
The plastic piece inside a USB port, also known as the "USB type A receptacle contact support tang" or simply the "tang/key", is not replaceable. Its main function is to maintain pressure between the contacts when a USB cable is plugged in and to ensure the proper orientation of the USB cable, so it cannot be plugged in the wrong way.
If the plastic piece is broken or removed, the USB port will still work, but the connection may be loose. This is because the plastic piece keeps the USB connectors plugged in securely. Without it, there is a risk of short circuiting or other issues, as some of the metal prongs or pins inside the port are exposed.
While it is not advisable to attempt repairs on a USB port with a missing tang/key, some users have suggested using "Krazy Glue" to reattach the broken piece. Others have recommended disabling the port entirely by plugging it to prevent anyone from accidentally inserting a USB cable.
If you choose to repair the USB port, it is important to note that the entire Type A connector will need to be replaced. This involves desoldering the USB connector from the PCB, which requires good tools and techniques to avoid damaging the PCB.
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The tang/key ensures the orientation of the plug
The plastic piece inside a USB port is called the "USB type A receptacle contact support tang" or simply the "tang/key". This tang/key ensures the proper orientation of the plug, preventing users from plugging the USB cable in backwards or upside down. The tang/key is not replaceable, and attempting to repair a USB port with this part missing can potentially damage the PCB.
If the plastic piece inside a USB port breaks off, the USB port will still function, but connections may become loose. In addition, the exposed pins carry power, and shorting them together could be dangerous. To prevent this, the port can be disabled by plugging it or covering it with tape or "Krazy Glue".
To determine the correct orientation of a USB plug, users can look at the plug end and orient it so that the side with the block of plastic is going into the side of the socket with a wide space. The USB symbol on the plug should also be pointing upwards for horizontal ports or leftwards for vertical ports. For USB 3.0 sockets, the orientation can often be determined by touch.
While USB-C plugs are supposed to be reversible, in reality, they only work in two out of infinite possible radial orientations.
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The USB port will still work without the plastic part
The plastic part inside a USB port, often referred to as a "USB pin guard", "USB type A receptacle contact support tang", or simply "the key", is not essential for the functionality of the port. Its main function is to maintain pressure between the contacts when a USB cable is plugged in and to ensure the correct orientation of the plug.
If the plastic part comes off, the USB port will still work without it. However, it may be more difficult to plug in a USB cable without the plastic piece to guide the orientation, and the connection may be less stable. In addition, there is a risk of short-circuiting if the exposed metal prongs or pins come into contact with other conductive materials. To prevent this, the plastic part can sometimes be glued back into place. If it cannot be reattached, the USB port should be disabled or taped over to prevent accidental insertion of other objects.
In some cases, the entire USB connector may need to be replaced, especially if the plastic part cannot be reattached and the exposed prongs or pins are at risk of being bent or damaged. This is a delicate procedure that requires good tools and techniques to avoid damaging the PCB, so it is best left to an expert.
It is worth noting that while the USB port may still function without the plastic part, it is always recommended to handle electronic components with care to avoid potential damage or injury.
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The plastic part can be glued back in place
The plastic part inside a USB port is called the "USB type A receptacle contact support tang" or "key". It is not replaceable, and if it breaks, the whole Type A connector will need to be replaced. However, if the plastic part has merely come loose and is still intact, it may be possible to glue it back in place. Krazy Glue and epoxy have been suggested as possible adhesives for this purpose.
If you are considering gluing the plastic part back in place, it is important to be aware of the risks. The plastic part helps to ensure that USB cables are inserted with the correct orientation and are pressed against the contacts inside the USB port. If the plastic part is not present, it is possible to insert a USB cable backwards, which could result in a short circuit. Therefore, if you are unable to glue the plastic part back in place or replace the connector, it is recommended that you disable the port to prevent anyone from accidentally inserting a USB cable.
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Frequently asked questions
The USB specification doesn't give it a name, but it can be referred to as the "USB type A receptacle contact support tang" or the "USB pin guard". Its function is to maintain pressure between the contacts when you plug in a USB cable and to enforce the proper orientation of the cable.
If the plastic piece inside a USB port breaks off, the port may still work, but the connection may be loose. There are a few potential solutions to this problem, including gluing the piece back in place, disabling the port, or desoldering the USB connector from the PCB to repair it.
To remove plastic fragments from a USB port, you can use materials like Blu Tack or acrylic caulk. Press the Blu Tack onto the area and push fairly hard, then pull it off. The acrylic caulk will shrink and grip the fragment as it cures, allowing you to create a "handle" to remove the fragment.
