Adafruit
Round Panel Mount 5.5mm/2.1mm DC Barrel Jack Extension Cable
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A panel-mount DC barrel jack extension cable that lets you add a clean, professional power input to any enclosure — without cutting custom-shaped holes. The ...
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A panel-mount DC barrel jack extension cable that lets you add a clean, professional power input to any enclosure — without cutting custom-shaped holes. The round flange means you only need a standard 1″ (25 mm) drilled hole. Unscrew the plastic nut, insert through the panel, and tighten. Done.
The cable is 30 cm (11.8″) long with a 5.5 mm / 2.1 mm barrel jack on each end. The panel-mount end features a solid body with a forgiving plastic lip that neatly hides the drill hole. Compatible with panels from a few millimetres up to 16 mm thick.
Key Features
- Round Panel Mount – Only requires a standard 1″ drilled hole, no custom shapes needed
- 5.5 mm / 2.1 mm Barrel Jack – Standard DC power connector
- 30 cm Cable Length – Enough reach for most enclosures
- Threaded Nut Mounting – Secure attachment with included plastic nut
- Forgiving Plastic Lip – Hides the drill hole for a clean finish
Specifications
- Connector – 5.5 × 2.1 mm DC barrel jack
- Flange Diameter – 30 mm
- Threaded Section – 23 mm diameter
- Panel Thickness – Supports up to 16 mm (0.625″)
- Cable Length – 30 cm (11.8″)
Ideal For
- Adding DC power inputs to project enclosures
- Wood, plastic, or metal panel installations
- Extending DC barrel jack connections through housings
- DIY electronics enclosures and custom builds
Jargon buster
Plain-language definitions for the technical terms used above.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- DC barrel jack
- A round power connector commonly used for low-voltage DC power supplies, often described by its outer and inner diameters such as 5.5 x 2.1 mm. Matching the barrel size and polarity is important so the plug physically fits and powers the device correctly.
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