5521 DC Plug | Min. Length: 12.5mm | High-end Custom by DAJIANG Electronics

What is the minimum length of 5521 DC plug?

I. What is a 5521 Tuning Fork DC Plug?

Before we dive in, let’s first clarify what you’re probably using every day.

“5521” refers to the plug specification – outer diameter 5.5mm, inner diameter 2.1mm. This is the world’s most widely adopted DC plug standard, found in routers, security cameras, LED strip lights, TV boxes, and more.

“Tuning fork” describes the internal center positive pin: instead of a smooth tube, it has a slit cut into it, resembling a tuning fork. The advantage? It grips tighter! Even when your device vibrates or moves, the connection won’t loosen.

Common lengths for 5521 tuning fork plugs include 18.5mm, 20.5mm, and 22.5mm. But the spotlight today is on the newest, custom-made shortest version – just 12.5mm.

II. [Major News] Dajiang Electronics – 21 Years Focused on DC Plugs, Trusted for High-End Customization

Based in Dongguan, Dajiang Electronics was founded in 2005 and has been specializing in DC plugs for a full 21 years.

“Because we focus, we are trusted.”
That’s Dajiang’s motto.

Over the past two decades, Dajiang has grown from a small factory into a modern enterprise certified under ISO9001:2000 (Quality Management) and ISO14001:2004 (Environmental Management). Their products are exported worldwide to Europe, the US, Japan, South Korea, the Middle East, and beyond.

Today, we’re proud to spotlight Dajiang’s standout product:
5521 tuning fork DC plug, 12.5mm length with solder tabs – the shortest available in the entire 5521 series.

Why is “shortest” so important?

You might think shorter is a drawback, but in DC plugs, short is a sign of engineering strength.

At just 12.5mm, this plug delivers:

Broader device compatibility – Many compact devices (ultra-thin routers, mini cameras) have extremely limited internal space. Only a 12.5mm plug fits.

More flexible installation – Unlike 16.5mm, 18.5mm, or 20.5mm versions, the 12.5mm works in tight enclosures without sacrificing performance.

Creating this shortest plug requires 21 years of precision mold expertise and process know-how. Making a plug shorter is easy – but making it shorter while maintaining electrical performance, mating cycle life, and environmental compliance? That’s real craftsmanship.

Solving customer pain points. Creating value through customization.
*21 years of high-end focus – Dajiang Electronics.*

“Connection Creates Value” – not just a slogan, but what Dajiang has been delivering for over two decades.