# 5.5mm x 2.1mm DC Power Plug Set — Solder-Type Power Connector Adapter Kit > 5.5mm x 2.1mm オス DC電源プラグ はんだ電源ジャックアダプターコネクター + メス DCパネルソケットマウントアダプター はんだ+ 防塵プラグ オーディオ summary. A 3-piece solder-type DC power jack set (male plug, female panel socket, dust cover) in the common 5.5mm x 2.1mm size. Tags: adapter, dc-power-jack, 5.5mm-2.1mm, solder-type, panel-mount, dust-cover Source: https://www.amazon.co.jp/dp/B0753899SG Article page: https://web-autoai.com/articles/55mm-x-21mm-dc-dc?lang=en Prices and ratings change over time — check the article page for the current values. --- ## Overview This is a solder-type DC power jack adapter set that includes a male plug, a female panel-mount socket, and a dust cover, all in the common 5.5mm x 2.1mm size. It is designed for DIY electronics, security camera installations, and repair work where you need to extend or replace DC power connections without buying a pre-made cable. The key advantage of this set is its solder-termination design. You can attach it to any suitable wire, making it ideal for custom-length power cables, panel-mount power inputs, or replacing damaged connectors on existing equipment. The dust plug keeps the socket clean when not in use. Connector size: 5.5mm outer diameter, 2.1mm inner diameter (standard DC barrel jack) Male plug: attaches to the cable side, used as the output end of a power adapter Female panel-mount socket: fixed to a chassis or panel, serves as the device's power input Dust plug: inserted into the female socket when unused to prevent dust ingress Solder termination: compatible with stranded wire around 0.5–1.5mm² conductor cross-section Polarity is not pre-assigned; you decide positive/negative during wiring ## Product Info First released around 2017, this set has been a steady seller on . Check the retailer's page for the latest price. Warranty follows the seller's policy, but given its consumable nature, long-term coverage is not expected. Market positioning is clearly entry-level to mid-range. DIY electronics and PC modding enthusiasts: When you need to add a DC power input to a custom case, extend a fan controller's power cable, or power a Raspberry Pi from an external adapter, this set lets you create exactly the length and connector type you need. Security camera and CCTV installers: Broken power cables on outdoor cameras can be repaired quickly by soldering on a new male plug. The panel-mount socket is handy for building a custom distribution box, and the dust cap protects unused ports. Audio/video equipment repair technicians: Many legacy AV devices still use 5.5mm/2.1mm DC jacks. When original adapters are unavailable, this set allows you to fabricate a replacement cable. Not ideal for: Beginners who have never used a soldering iron, or anyone who prefers a plug-and-play solution. Pre-made extension cables or ready-to-use adapters are a better fit for those users. Soldering is required. You will need a soldering iron, solder, wire cutters, and a wire stripper. Basic electronics knowledge is assumed. No polarity marking is provided. Always use a multimeter to confirm positive/negative before connecting to your device. Current and voltage ratings are not explicitly stated. Typical 5.5mm/2.1mm DC jacks handle 2A–5A, but for high-current applications (over 5A), verify with a rated product. The panel-mount nut is included, but you must drill a hole (approx. 12mm diameter) in your chassis yourself. * The dust plug offers basic dust protection only; it is not waterproof. For outdoor use, apply additional sealing. Q: What is the current rating of this adapter? A: The manufacturer does not specify a rating. General-purpose 5.5mm/2.1mm DC jacks typically support 2A to 5A. If your device draws more than 2A, monitor for heat and consider a rated alternative. Q: Can I use this with a 2.5mm inner diameter plug? A: No, this set is designed for 2.1mm inner diameter only. A 2.5mm plug will not fit or will make poor contact. Look for a 2.5mm-specific product. Q: How effective is the dust plug? A: It prevents dust and light debris from entering the socket. It offers no waterproofing. For indoor stationary equipment, it works well; for outdoor or wet environments, additional sealing is required.