How do I know which DC plug size I need for my device?

You can determine the correct size by measuring the outer diameter (OD) and inner diameter (ID) of your original broken plug using digital calipers. Alternatively, check your device's manual; 5.5x2.1mm is the most common standard for generic electronics, while 5.5x2.5mm is often used for higher-current devices like laptops.

Is a copper-plated connector better than a standard silver-colored alloy one?

Yes, a copper-plated connector is significantly better because copper offers superior electrical conductivity and lower resistance. This ensures less heat generation at the connection point and provides excellent resistance against rust and oxidation over time.

Do I need a soldering iron to install this DC plug?

Yes, you must use a soldering iron to install this DC male plug. You need to strip your power cable, thread the wire through the black plastic housing, and solder the positive and negative wires to the internal metal lugs before screwing the housing closed.

Can I buy these connectors in bulk at your Hong Kong store?

Yes, you can purchase all four sizes of these copper-plated DC plugs in bulk at Sun Cheong Computer Co. Ltd. (新昌電腦有限公司) in Sham Shui Po. Our physical store caters to CCTV installers, repair technicians, and DIY hobbyists who need reliable components immediately.

Which internal lug is for the positive wire and which is for the negative?

For standard "center-positive" devices, the shorter internal lug (connected to the center pin) is for the positive (red) wire, and the longer outer lug (connected to the outer barrel sleeve) is for the negative (black) wire. Always verify your device's required polarity before soldering.

Copper-Plated DC Male Plug | 5.5x2.1mm & 3 Other Sizes

Name: Copper-Plated DC Male Plug | 5.5x2.1mm & 3 Other Sizes
Brand: Sun Cheong Computer Company Limited
SKU: 21AR000395
Price: 42.0 TWD
Availability: InStock

Short Product Description

The Premium Copper-Plated DC Male Plug is a high-quality, solder-type barrel connector designed for repairing power adapters, CCTV cables, and DIY electronics. Available in four industry-standard sizes (5.5x2.1mm, 5.5x2.5mm, 3.5x1.3mm, and 4.0x1.7mm), this connector features a copper-plated core for superior electrical conductivity and corrosion resistance. Available for instant pickup at Sun Cheong Computer Co. Ltd. (新昌電腦有限公司) in Sham Shui Po, our physical store provides the perfect reliable components for your custom power routing and hardware repair needs.

Key Features

Premium Copper-Plated Core: Delivers excellent electrical conductivity and prevents oxidation for a longer, more reliable lifespan.
Four Standard Sizes: Available in 5.5x2.1mm, 5.5x2.5mm, 3.5x1.3mm, and 4.0x1.7mm to fit a vast array of DC-powered devices.
Solder-Type Terminals: Features easy-to-solder internal lugs for creating strong, permanent electrical connections.
Screw-On Plastic Housing: The durable black outer shell provides physical protection and acts as strain relief for the attached cable.
Versatile Application: Perfect for repairing laptop chargers, extending CCTV power lines, or building custom STEM project power supplies.

Full Product Description

Reliable Power Routing for DIY Electronics

This Copper-Plated DC Male Plug provides a secure, low-resistance connection for repairing broken power adapters and building custom power cables. By utilizing a standard solder-lug design with a screw-on plastic housing, it allows makers and technicians to easily replace damaged laptop charger tips or create custom-length power extensions for CCTV cameras. This hands-on repair solution saves you from having to replace entire power supply units just because of a frayed connector.

High-Quality Copper-Plated Construction

The connector features a premium copper-plated metal core that maximizes electrical conductivity and resists long-term corrosion. Unlike cheap alloy connectors that degrade and cause power fluctuations over time, this HQ DC Barrel Jack ensures a stable, uninterrupted flow of DC power to your sensitive electronics. The durable black plastic outer shell screws tightly over the soldered joints, providing essential strain relief and physical protection.

Multiple Size Variants for Universal Compatibility

You can choose from four distinct barrel sizes to perfectly match your specific device's power receptacle. The available variants include 5.5x2.1mm (standard for Arduino and LED strips), 5.5x2.5mm (common for high-power routers and laptops), 3.5x1.3mm, and 4.0x1.7mm (often used for Sony PSPs, portable DVD players, and specific network switches). This comprehensive selection ensures you have the exact fit required for a snug, wobble-free connection.

Pro Tip from Our Technicians

When soldering your power cables to this DC Male Plug, our Sham Shui Po technical team strongly advises using heat shrink tubing over the internal positive (center pin) and negative (outer sleeve) solder joints. Because the internal space of the plastic housing is tight, heat shrink tubing thoroughly prevents stray wire strands from causing a short circuit. Always use a multimeter to verify your center-positive or center-negative polarity before plugging the repaired cable into your expensive electronics!

Technical Specifications

Product Type: DC Power Male Plug (Barrel Connector)
Material: Copper-Plated Metal Core with Plastic Housing
Connection Method: Solder Type
Variant 1 Size: 5.5mm (Outer Diameter) x 2.1mm (Inner Diameter)
Variant 2 Size: 5.5mm (Outer Diameter) x 2.5mm (Inner Diameter)
Variant 3 Size: 3.5mm (Outer Diameter) x 1.3mm (Inner Diameter)
Variant 4 Size: 4.0mm (Outer Diameter) x 1.7mm (Inner Diameter)
Electrical Ratings (Voltage/Current): Not specified — confirm manually based on your cable gauge and power supply limits.

Delivery Options

Local delivery within Hong Kong and in-store pickup.
Free shipping for orders of HK$400 or above; HK$35 shipping fee for orders below HK$400.
Shipped by SF Express, usually dispatched the same day for orders confirmed before 6:00 PM (Mon–Sat).
Estimated delivery time: 1–3 business days after dispatch (Hong Kong).
In-store pickup details (location and time) will be confirmed by email or phone message.
Delivery times are estimates and may be affected by weather or unforeseen circumstances.

FAQ Section

How do I know which DC plug size I need for my device?You can determine the correct size by measuring the outer diameter (OD) and inner diameter (ID) of your original broken plug using digital calipers. Alternatively, check your device's manual; 5.5x2.1mm is the most common standard for generic electronics, while 5.5x2.5mm is often used for higher-current devices like laptops.
Is a copper-plated connector better than a standard silver-colored alloy one?Yes, a copper-plated connector is significantly better because copper offers superior electrical conductivity and lower resistance. This ensures less heat generation at the connection point and provides excellent resistance against rust and oxidation over time.
Do I need a soldering iron to install this DC plug?Yes, you must use a soldering iron to install this DC male plug. You need to strip your power cable, thread the wire through the black plastic housing, and solder the positive and negative wires to the internal metal lugs before screwing the housing closed.
Can I buy these connectors in bulk at your Hong Kong store?Yes, you can purchase all four sizes of these copper-plated DC plugs in bulk at Sun Cheong Computer Co. Ltd. (新昌電腦有限公司) in Sham Shui Po. Our physical store caters to CCTV installers, repair technicians, and DIY hobbyists who need reliable components immediately.
Which internal lug is for the positive wire and which is for the negative?For standard "center-positive" devices, the shorter internal lug (connected to the center pin) is for the positive (red) wire, and the longer outer lug (connected to the outer barrel sleeve) is for the negative (black) wire. Always verify your device's required polarity before soldering.

Target Users / Applications

CCTV Installers: Creating custom-length 12V power extension cables for security cameras using the standard 5.5x2.1mm variant.
Laptop Repair Technicians: Replacing frayed or broken charging tips on older laptops and routers using the 5.5x2.5mm variant.
STEM Hobbyists: Soldering reliable power inputs for custom Arduino enclosures, LED light strips, and portable battery packs.