You need to connect a bare cable end to a device that expects a standard DC barrel plug. Maybe a CCTV camera power cable was cut short in the field. Maybe you are building an alarm panel and the power supply terminates in bare wire. Soldering works, given the tools and the time. The GBC 67.3750.69/S does it with a screwdriver.
This guide explains the 5.5×2.1mm barrel standard, the male-versus-female distinction, and when a screw terminal connection makes sense rather than a soldered joint. It is based on the product specification and the GBC Elettronica manufacturer page. No owner reviews exist for this product, so this is a buying guide only.
The inner diameter is the spec that decides
The 5.5mm outer barrel is a standard size shared across CCTV cameras, alarm panels, and AV equipment. The inner pin diameter is where most wrong purchases happen. Two standards share the same outer barrel: 2.1mm and 2.5mm. They look identical from the outside. A 2.5mm pin sits loosely in a 2.1mm socket. A 2.1mm pin may insert into a 2.5mm socket but will not make reliable electrical contact.
The GBC 67.3750.69/S is the 2.1mm inner version. Before ordering, check the label on your device or the markings on the original power supply connector. If the device or supply spec says 5.5×2.5mm, this adapter will not mate correctly.
Male or female: which end faces the device
A DC barrel male plug has a hollow outer cylinder with a centre pin inside. It inserts into the device's female DC input socket. Most field adapters that put a barrel connector on a bare wire are male, because the device's own DC input is a built-in female socket.
The GBC 67.3750.69/S is male. You strip the cable, secure it in the screw terminal, and the barrel end plugs into the device.
If your cable already has a male barrel plug on it and you need to terminate a power supply lead into a panel, you need the female socket version instead. The GBC 67.3750.74/S in our range is female, though note it is the 5.5×2.5mm size, not 2.1mm.
Screw terminal or soldered plug: the real trade-off
Soldering gives a compact, permanent joint. Done correctly it is durable, low-resistance, and barely adds bulk. The cost is a soldering iron, the right flux, and a steady hand while the solder cools.
A screw terminal trades that compactness for speed and reversibility. Strip the insulation from each conductor, insert both into the terminal block, and tighten the two screws. No heat required. You can loosen the screws later and re-wire if the installation needs to change. For field repairs, test bench setups, and alarm installations where cabling may be reorganised, that reversibility is practical.
GBC specifies nickel-plated brass for the body. Nickel plating resists the oxidation that slowly degrades bare copper contact surfaces. That matters in CCTV and alarm runs that are expected to work unattended for years.
What the GBC 67.3750.69/S gives you
The GBC 67.3750.69/S is a cable-mount adapter in straight orientation. One end is a DC barrel male connector with 5.5mm outer and 2.1mm inner diameter. The other end is a 2-pole screw terminal for a stripped two-conductor cable. No tools needed beyond a small screwdriver.
| Connector | DC male barrel, 5.5mm outer / 2.1mm inner |
|---|---|
| Second end | 2-pole screw terminal |
| Orientation | Straight, cable-mount |
| Material | Nickel-plated brass |
| Box contents | 1× GBC 67.3750.69/S adapter |
The related connector to check first
Our Connectors & Terminals range includes the GBC 67.3750.74/S, which is the female socket version in the 5.5×2.5mm size. It mounts on a cable the same way but presents a female barrel socket rather than a male plug, and it takes the 2.5mm inner diameter. Before ordering either connector, confirm which inner size your device requires: 2.1mm or 2.5mm.
Common mistakes
Wrong inner diameter. The 2.1mm and 2.5mm sizes share the same 5.5mm outer barrel. They look identical. Force-fitting the wrong size gives intermittent contact and can damage the socket. Check the device label before you order.
Reversed polarity. The screw terminal has no keying. Most DC equipment uses centre positive (the inner pin carries the positive conductor), but not all. If you do not know the polarity of your device, check its label or the original power supply before wiring. Reversed polarity can damage electronics.
Too much stripped insulation. In a 2-pole terminal block, excess exposed conductor risks the two wires touching inside the clamp. Strip only enough insulation to seat the conductor firmly in the terminal.
Frequently asked questions
Can I reuse this adapter on a different cable?
Yes. Loosen the two screws, remove the old cable, strip the new one, insert and tighten. The screw terminal is designed for repeated use, which is one of the main reasons to choose it over a soldered joint in serviceable installations.
Does this adapter have an IP environmental rating?
GBC does not publish an IP rating for the 67.3750.69/S. Use it in protected, dry locations. Bare screw terminal connections should not be left exposed to moisture or condensation.
Is 5.5×2.1mm the right size for my CCTV camera or alarm panel?
5.5×2.1mm is one of the two most common barrel connector sizes used on CCTV cameras, alarm panels, and AV equipment. The other common inner size is 2.5mm. They share the same outer barrel, so they look the same from the outside but will not mate reliably across sizes. Check the label on your device or the markings on the original power supply connector.
What is the difference between the GBC 67.3750.69/S and the 67.3750.74/S?
The 67.3750.69/S is a male plug with a 2.1mm inner pin. The 67.3750.74/S is a female socket with a 2.5mm inner diameter. They differ in both connector gender and inner size. Order by what your device's DC input actually requires.
Does the straight orientation matter for my installation?
Straight means the cable exits in line with the barrel connector body, not at a right angle. For most panel and shelf installations where the cable runs along the back of an enclosure, straight is the practical choice. Right-angle versions exist for confined spaces where the cable must turn immediately, but this product is straight only.
Quick recommendation
This adapter has one job: add a 5.5×2.1mm DC barrel male plug to a stripped cable without soldering. If that is your job, this does it. Confirm the inner diameter against your device before you order. Check the polarity of your device before you wire it.
The GBC 67.3750.69/S is in stock at Lynk.gr, sold individually.
